RESUMO

The objective, with this study, was to investigate the consequences of subclinical hypomagnesemia on the metabolic parameters of dairy cows. Blood samples were collected from 12 animals every two days, between -22 pre and 22 days postpartum, for blood analysis and determining the metabolic profile. The animals were grouped according to magnesium blood concentrations: Hypomagnesemia group (n=5), with blood levels below 1.8 mg/dL in at least two consecutive days, and Control group (n=7), with blood levels above 1.8 mg/dL during the period. The hypomagnesemia group had higher levels of glucagon on days 10, 18 and 20 as well as glucagon/insulin ratio was higher on 6, 8, 10, 12 and 16 days after calving. The blood concentrations of aspartate aminotransferase in the hypomagnesemia group were higher during days 0, 6, 8, 10, 12 and 14 after calving. The results indicate that the low blood levels of magnesium during peripartum may be associated with elevated levels of aspartate amino transferase and glucagon in the blood. In general, subclinical hypomagnesemia does not alter the levels of indicators of energy metabolism, but the results show that cows with hypomagnesemia have a higher rate of glucagon/insulin, demonstrating a greater challenge to maintain glucose blood concentration.(AU)

O objetivo, com este estudo, foi investigar as conseqüências da hipomagnesemia subclínica sobre parâmetros metabólicos de vacas leiteiras. Amostras de sangue foram coletadas de 12 animais, a cada dois dias, entre os dias 22 pré e 22 pós-parto, para a realização de análises sanguíneas e determinação do perfil metabólico. Os animais foram categorizados de acordo com os níveis séricos de magnésio: Grupo Hipomagnesêmicas (n=5), com níveis abaixo de 1,8 mg/dL em ao menos dois dias consecutivos, e o Grupo Controle (n=7), com níveis acima de 1,8 mg/dL em todo o período. O grupo hipomagnesêmicas apresentou níveis de glucagon maiores nos dias 10, 18 e 20, e a taxa Glucagon/Insulina foi maior nos dias 6, 8, 10, 12 e 16 após o parto. As concentrações de aspartato amino transferase foram maiores no grupo hipomagnesêmicas nos dias 0, 6, 8, 10, 12 e 14 pós-parto. Os resultados indicaram que níveis reduzidos de magnésio no periparto podem estar relacionados com níveis elevados de aspartato amino transferase e de glucagon. Em geral, a hipomagnesemia subclínica não altera os níveis dos indicadores do metabolismo energético, mas os resultados demonstraram que as vacas com hipomagnesemia apresentaram maior taxa de glucagon/insulina, demonstrando um maior desafio para manter os níveis glicêmicos.(AU)

Assuntos

RESUMO

O objetivo, com este estudo, foi investigar as conseqüências da hipomagnesemia subclínica sobre parâmetros metabólicos de vacas leiteiras. Amostras de sangue foram coletadas de 12 animais, a cada dois dias, entre os dias 22 pré e 22 pós-parto, para a realização de análises sanguíneas e determinação do perfil metabólico. Os animais foram categorizados de acordo com os níveis séricos de magnésio: Grupo Hipomagnesêmicas (n=5), com níveis abaixo de 1,8 mg/dL em ao menos dois dias consecutivos, e o Grupo Controle (n=7), com níveis acima de 1,8 mg/dL em todo o período. O grupo hipomagnesêmicas apresentou níveis de glucagon maiores nos dias 10, 18 e 20, e a taxa Glucagon/Insulina foi maior nos dias 6, 8, 10, 12 e 16 após o parto. As concentrações de aspartato amino transferase foram maiores no grupo hipomagnesêmicas nos dias 0, 6, 8, 10, 12 e 14 pós-parto. Os resultados indicaram que níveis reduzidos de magnésio no periparto podem estar relacionados com níveis elevados de aspartato amino transferase e de glucagon. Em geral, a hipomagnesemia subclínica não altera os níveis dos indicadores do metabolismo energético, mas os resultados demonstraram que as vacas com hipomagnesemia apresentaram maior taxa de glucagon/insulina, demonstrando um maior desafio para manter os níveis glicêmicos.

The objetctive, with this study, was to investigate the consequences of subclinical hypomagnesemia on the metabolic parameters of dairy cows. Blood samples were collected from 12 animals every two days, between -22 pre and 22 days postpartum, for blood analysis and determining the metabolic profile. The animals were grouped according to magnesium blood concentrations: Hypomagnesemia group (n=5), with blood levels below 1.8 mg/dL in at least two consecutive days, and Control group (n=7), with blood levels above 1.8 mg/dL during the period. The hypomagnesemia group had higher levels of glucagon on days 10, 18 and 20 as well as glucagon/insulin ratio was higher on 6, 8, 10, 12 and 16 days after calving. The blood concentrations of aspartate aminotransferase in the hypomagnesemia group were higher during days 0, 6, 8, 10, 12 and 14 after calving. The results indicate that the low blood levels of magnesium during peripartum may be associated with elevated levels of aspartate amino transferase and glucagon in the blood. In general, subclinical hypomagnesemia does not alter the levels of indicators of energy metabolism, but the results show that cows with hypomagnesemia have a higher rate of glucagon/insulin, demonstrating a greater challenge to maintain glucose blood concentration.

Assuntos

RESUMO

O objetivo, com este estudo, foi investigar as conseqüências da hipomagnesemia subclínica sobre parâmetros metabólicos de vacas leiteiras. Amostras de sangue foram coletadas de 12 animais, a cada dois dias, entre os dias 22 pré e 22 pós-parto, para a realização de análises sanguíneas e determinação do perfil metabólico. Os animais foram categorizados de acordo com os níveis séricos de magnésio: Grupo Hipomagnesêmicas (n=5), com níveis abaixo de 1,8 mg/dL em ao menos dois dias consecutivos, e o Grupo Controle (n=7), com níveis acima de 1,8 mg/dL em todo o período. O grupo hipomagnesêmicas apresentou níveis de glucagon maiores nos dias 10, 18 e 20, e a taxa Glucagon/Insulina foi maior nos dias 6, 8, 10, 12 e 16 após o parto. As concentrações de aspartato amino transferase foram maiores no grupo hipomagnesêmicas nos dias 0, 6, 8, 10, 12 e 14 pós-parto. Os resultados indicaram que níveis reduzidos de magnésio no periparto podem estar relacionados com níveis elevados de aspartato amino transferase e de glucagon. Em geral, a hipomagnesemia subclínica não altera os níveis dos indicadores do metabolismo energético, mas os resultados demonstraram que as vacas com hipomagnesemia apresentaram maior taxa de glucagon/insulina, demonstrando um maior desafio para manter os níveis glicêmicos.

RESUMO

O objetivo, com este estudo, foi investigar as conseqüências da hipomagnesemia subclínica sobre parâmetros metabólicos de vacas leiteiras. Amostras de sangue foram coletadas de 12 animais, a cada dois dias, entre os dias 22 pré e 22 pós-parto, para a realização de análises sanguíneas e determinação do perfil metabólico. Os animais foram categorizados de acordo com os níveis séricos de magnésio: Grupo Hipomagnesêmicas (n=5), com níveis abaixo de 1,8 mg/dL em ao menos dois dias consecutivos, e o Grupo Controle (n=7), com níveis acima de 1,8 mg/dL em todo o período. O grupo hipomagnesêmicas apresentou níveis de glucagon maiores nos dias 10, 18 e 20, e a taxa Glucagon/Insulina foi maior nos dias 6, 8, 10, 12 e 16 após o parto. As concentrações de aspartato amino transferase foram maiores no grupo hipomagnesêmicas nos dias 0, 6, 8, 10, 12 e 14 pós-parto. Os resultados indicaram que níveis reduzidos de magnésio no periparto podem estar relacionados com níveis elevados de aspartato amino transferase e de glucagon. Em geral, a hipomagnesemia subclínica não altera os níveis dos indicadores do metabolismo energético, mas os resultados demonstraram que as vacas com hipomagnesemia apresentaram maior taxa de glucagon/insulina, demonstrando um maior desafio para manter os níveis glicêmicos.

RESUMO

Background: The search for productivity increase in finish ruminants is related with the intensification of production. The use of concentrated feed in finish lambs can determine a profitable product and quality, wich reachs ideal weight in a short time. However, the addition of concentrated feed can cause a shift in the whole rumen ecosystem, and as a result, having animals more susceptible to metabolic disorders. As protozoa have their growth stimulated or inhibited by dietary factors, it becomes important to quantify and evaluate its activity in response to diets for ruminants. Thus, using measurements of the number of protozoa in the rumen fluid, we are able to make early diagnosis of possible metabolic disorders, as well as adjustments in ration formulations. The objective of this study was to evaluate the concentration and activity of protozoa in rumen of sheep in a feedlot diet, and validate an adaptation of the technique Dehority for counting of protozoa in the rumen fluid. Materials, Methods & Results: It were utilized 5 crossbred Texel x Corriedale ewes not pregnant, not lactating, with approximately 18 months old and with average weight of 50.73 ± 4.38 kg. The females were kept confined, receiving water and ration ad libitum in individual feeders. Ewes were fed twice (8:30 and 16:30) daily with a diet aiming to provide the DM intake equivalent to 3.5% of body weight. The roughage supply was 60% of DM, divided into Alfalfa hay (Medicago sativa) and Tifton 85 (Cynodondactylon), plus supplementation with commercial concentrate of 40%. Before the experimental period, we conducted a pre-trial adaptation period (21 days in length). Pre-prandial ruminal fluid collections were performed before the AM feeding, at intervals of seven days, during 35 days (Day 0 to Day 35 of the experiment), in a total of six collections. The rumen fluid was collected through oro-ruminal probe and the contents stored in sterile containers for immediate realization of sedimentation and flotation tests, methylene blue reduction test and ruminal pH.The values found in the rumen evaluations are in agreement physiological parameters for sheep. The average number of protozoa in rumen fluid in the range of 35 days was similar to other studies. Discussion: In this study, supplementation of concentrate at 1.4% of BW did not induce ruminal acidosis, as well as other changes in the analysis of rumen fluid, demonstrating an appropriate relation concentrate/roughage in the diet. Furthermore, the supply of forages (Alfalfa hay and Tifton) at 60% of the diet (DM basis), or 2.1% of BW, was crucial to maintaining stable rumen pH. However, we observed an increase (P < 0.05) in the number of protozoa associated with the course of the experimental period. Moreover, this study we observed that even after a adaptation period of 21 days, the average number of protozoa in rumen fluid continued with a significant gradual increase. Using an alternative methodology was possible to validate a technical adaptation to the counting of protozoa in rumen fluid proposed by Dehority. In conclusion, diets based on alfalfa hay and Tifton, plus supplementation with concentrated promote a gradual increase in the number of ruminal protozoa in confined ewes, without any interference in other markers of rumen activity.

Assuntos

RESUMO

Background: The search for productivity increase in finish ruminants is related with the intensification of production. The use of concentrated feed in finish lambs can determine a profitable product and quality, wich reachs ideal weight in a short time. However, the addition of concentrated feed can cause a shift in the whole rumen ecosystem, and as a result, having animals more susceptible to metabolic disorders. As protozoa have their growth stimulated or inhibited by dietary factors, it becomes important to quantify and evaluate its activity in response to diets for ruminants. Thus, using measurements of the number of protozoa in the rumen fluid, we are able to make early diagnosis of possible metabolic disorders, as well as adjustments in ration formulations. The objective of this study was to evaluate the concentration and activity of protozoa in rumen of sheep in a feedlot diet, and validate an adaptation of the technique Dehority for counting of protozoa in the rumen fluid. Materials, Methods & Results: It were utilized 5 crossbred Texel x Corriedale ewes not pregnant, not lactating, with approximately 18 months old and with average weight of 50.73 ± 4.38 kg. The females were kept confined, receiving water and ration ad libitum in individual feeders. Ewes were fed twice (8:30 and 16:30) daily with a diet aiming to provide the DM intake equivalent to 3.5% of body wei

Background: The search for productivity increase in finish ruminants is related with the intensification of production. The use of concentrated feed in finish lambs can determine a profitable product and quality, wich reachs ideal weight in a short time. However, the addition of concentrated feed can cause a shift in the whole rumen ecosystem, and as a result, having animals more susceptible to metabolic disorders. As protozoa have their growth stimulated or inhibited by dietary factors, it becomes important to quantify and evaluate its activity in response to diets for ruminants. Thus, using measurements of the number of protozoa in the rumen fluid, we are able to make early diagnosis of possible metabolic disorders, as well as adjustments in ration formulations. The objective of this study was to evaluate the concentration and activity of protozoa in rumen of sheep in a feedlot diet, and validate an adaptation of the technique Dehority for counting of protozoa in the rumen fluid. Materials, Methods & Results: It were utilized 5 crossbred Texel x Corriedale ewes not pregnant, not lactating, with approximately 18 months old and with average weight of 50.73 ± 4.38 kg. The females were kept confined, receiving water and ration ad libitum in individual feeders. Ewes were fed twice (8:30 and 16:30) daily with a diet aiming to provide the DM intake equivalent to 3.5% of body wei

RESUMO

Background: The search for productivity increase in finish ruminants is related with the intensification of production. The use of concentrated feed in finish lambs can determine a profitable product and quality, wich reachs ideal weight in a short time. However, the addition of concentrated feed can cause a shift in the whole rumen ecosystem, and as a result, having animals more susceptible to metabolic disorders. As protozoa have their growth stimulated or inhibited by dietary factors, it becomes important to quantify and evaluate its activity in response to diets for ruminants. Thus, using measurements of the number of protozoa in the rumen fluid, we are able to make early diagnosis of possible metabolic disorders, as well as adjustments in ration formulations. The objective of this study was to evaluate the concentration and activity of protozoa in rumen of sheep in a feedlot diet, and validate an adaptation of the technique Dehority for counting of protozoa in the rumen fluid. Materials, Methods & Results: It were utilized 5 crossbred Texel x Corriedale ewes not pregnant, not lactating, with approximately 18 months old and with average weight of 50.73 ± 4.38 kg. The females were kept confined, receiving water and ration ad libitum in individual feeders. Ewes were fed twice (8:30 and 16:30) daily with a diet aiming to provide the DM intake equivalent to 3.5% of body wei

Background: The search for productivity increase in finish ruminants is related with the intensification of production. The use of concentrated feed in finish lambs can determine a profitable product and quality, wich reachs ideal weight in a short time. However, the addition of concentrated feed can cause a shift in the whole rumen ecosystem, and as a result, having animals more susceptible to metabolic disorders. As protozoa have their growth stimulated or inhibited by dietary factors, it becomes important to quantify and evaluate its activity in response to diets for ruminants. Thus, using measurements of the number of protozoa in the rumen fluid, we are able to make early diagnosis of possible metabolic disorders, as well as adjustments in ration formulations. The objective of this study was to evaluate the concentration and activity of protozoa in rumen of sheep in a feedlot diet, and validate an adaptation of the technique Dehority for counting of protozoa in the rumen fluid. Materials, Methods & Results: It were utilized 5 crossbred Texel x Corriedale ewes not pregnant, not lactating, with approximately 18 months old and with average weight of 50.73 ± 4.38 kg. The females were kept confined, receiving water and ration ad libitum in individual feeders. Ewes were fed twice (8:30 and 16:30) daily with a diet aiming to provide the DM intake equivalent to 3.5% of body wei

RESUMO

As micotoxicoses são grandes causadoras de perdas produtivas em ruminantes, sendo aflatoxina (AFLA) e zearalenona (ZEA) as principais micotoxinas encontradas em alimentos conservados. Estas micotoxinas apresentam efeito sobre o metabolismo animal, através da ação anabólica de metabólitos da ZEA, bem como pelas lesões hepáticas causadas pela AFLA. O objetivo deste estudo foi determinar a influência do adsorvente glucomanano modificado sobre parâmetros metabólicos de ovelhas submetidas à dietas contendo AFLA e ZEA. Foram utilizadas 34 fêmeas divididas em 6 grupos (ZEA; ZEA+ADS; AFLA; AFLA+ADS; CONTROLE+ADS; CONTROLE), recebendo 1,0 mg/kg de ZEA, 1,5 mg/kg de AFLA e/ou 2kg/ton de adsorvente. A ZEA diminuiu os níveis séricos de glicose, em relação ao CONTROLE (p<0,05), porém, o adsorvente não influenciou os níveis de glicose, não havendo diferença entre os grupos ZEA e ZEA+ADS. A ZEA aumentou os níveis de AST e GGT em relação ao grupo CONTROLE (p<0,05), sendo que os níveis de AST foram superiores no grupo ZEA (p<0,05), quando comparado ao grupo ZEA+ADS. Ainda, a aflatoxina causou uma redução nos níveis de albumina, em relação aos valores fisiológicos de ovinos. Assim, a partir destes resultados pode-se concluir que a ZEA causou alterações metabólicas em ovinos, bem como o glucomanano modificado foi eficiente em reduzir a possível agressão hepática causada por esta micotoxina, demonstrada pela diminuição nos níveis de AST.

The micotoxicoses are causing great losses of production in ruminants, being aflatoxin (AFLA) and zearalenone (ZEA) the major mycotoxins found in foods preserved. These mycotoxins have effect on the metabolism animal through the anabolic action of metabolites of the ZEA, and the liver injury caused by AFLA. The purpose of this study was to determine the influence of the sorbent modified glucomannan on metabolic parameters of sheep submitted to diets containing AFLA and ZEA. Were used 34 females divided into 6 groups (ZEA; ZEA+ADS; AFLA; AFLA+ADS; CONTROL+ADS; CONTROL), receiving 1.0 mg/kg of ZEA, 1.5 mg/kg of AFLA and/or 2kg/ton of sorbent. The ZEA decreased serum levels of glucose, for the CONTROL (p <0.05), however, the sorbent not influence the levels of glucose, with no difference between groups ZEA and ZEA+ADS. The ZEA increased levels of AST and GGT compared to group CONTROL (p <0.05), whereas the levels of AST were higher in the group ZEA (p <0.05) when compared to the group ZEA+ADS. Still, the aflatoxin caused a reduction in the levels of albumin, for physiological values of sheep. Thus, from these results it was concluded that ZEA caused metabolic alterations in sheep, and the modified glucomannan was effective in reducing the possible liver aggression caused by this mycotoxin, shown by the decrease in the levels of AST.

Assuntos

RESUMO

As micotoxicoses são grandes causadoras de perdas produtivas em ruminantes, sendo aflatoxina (AFLA) e zearalenona (ZEA) as principais micotoxinas encontradas em alimentos conservados. Estas micotoxinas apresentam efeito sobre o metabolismo animal, através da ação anabólica de metabólitos da ZEA, bem como pelas lesões hepáticas causadas pela AFLA. O objetivo deste estudo foi determinar a influência do adsorvente glucomanano modificado sobre parâmetros metabólicos de ovelhas submetidas à dietas contendo AFLA e ZEA. Foram utilizadas 34 fêmeas divididas em 6 grupos (ZEA; ZEA+ADS; AFLA; AFLA+ADS; CONTROLE+ADS; CONTROLE), recebendo 1,0 mg/kg de ZEA, 1,5 mg/kg de AFLA e/ou 2kg/ton de adsorvente. A ZEA diminuiu os níveis séricos de glicose, em relação ao CONTROLE (p<0,05), porém, o adsorvente não influenciou os níveis de glicose, não havendo diferença entre os grupos ZEA e ZEA+ADS. A ZEA aumentou os níveis de AST e GGT em relação ao grupo CONTROLE (p<0,05), sendo que os níveis de AST foram superiores no grupo ZEA (p<0,05), quando comparado ao grupo ZEA+ADS. Ainda, a aflatoxina causou uma redução nos níveis de albumina, em relação aos valores fisiológicos de ovinos. Assim, a partir destes resultados pode-se concluir que a ZEA causou alterações metabólicas em ovinos, bem como o glucomanano modificado foi eficiente em reduzir a possível agressão hepática causada por esta micotoxina, demonstrada pela diminuição nos níveis de AST.(AU)

The micotoxicoses are causing great losses of production in ruminants, being aflatoxin (AFLA) and zearalenone (ZEA) the major mycotoxins found in foods preserved. These mycotoxins have effect on the metabolism animal through the anabolic action of metabolites of the ZEA, and the liver injury caused by AFLA. The purpose of this study was to determine the influence of the sorbent modified glucomannan on metabolic parameters of sheep submitted to diets containing AFLA and ZEA. Were used 34 females divided into 6 groups (ZEA; ZEA+ADS; AFLA; AFLA+ADS; CONTROL+ADS; CONTROL), receiving 1.0 mg/kg of ZEA, 1.5 mg/kg of AFLA and/or 2kg/ton of sorbent. The ZEA decreased serum levels of glucose, for the CONTROL (p <0.05), however, the sorbent not influence the levels of glucose, with no difference between groups ZEA and ZEA+ADS. The ZEA increased levels of AST and GGT compared to group CONTROL (p <0.05), whereas the levels of AST were higher in the group ZEA (p <0.05) when compared to the group ZEA+ADS. Still, the aflatoxin caused a reduction in the levels of albumin, for physiological values of sheep. Thus, from these results it was concluded that ZEA caused metabolic alterations in sheep, and the modified glucomannan was effective in reducing the possible liver aggression caused by this mycotoxin, shown by the decrease in the levels of AST.(AU)

Assuntos

RESUMO

Desequilíbrios entre os nutrientes que ingressam no organismo animal, sua biotransformação e a eliminação das substâncias resultantes podem ocasionar alterações no metabolismo animal. A conseqüência direta dessa condição é a ocorrência das doenças metabó¬licas, também conhecidas como doenças da produção. Muitos desses desequilíbrios podem provocar doenças subclínicas que são de difícil percepção, limitando a produção de um modo persistente, provocando uma diminuição da produção, ocasionando perdas na rentabilidade do produtor e ainda possíveis alterações na composição e qualidade do leite. Os transtornos metabólicos podem ser detectados pelo estudo dos perfis bioquímicos no sangue. O objetivo deste estudo foi avaliar parâmetros do perfil metabólico e do leite em diferentes categorias de vacas leiteiras da raça Jersey em rebanhos do sul do Rio Grande do Sul. Foram utilizadas 59 vacas da raça Jersey de diferentes propriedades da região sul do Rio Grande do Sul, as fêmeas foram divididas em três grupos: o primeiro de vacas (L1) 7 a 80 dias de lactação, o segundo (L2) com vacas de 81 a 270 dias de lactação e o terceiro (vacas secas) com vacas de 45 a 10 dias pré¬parto. Amostras de sangue e leite foram coletadas e encaminhadas aos laboratórios da Univer¬sidade Federal de Pelotas/Brasil, onde foram mensurados os seguintes parâmetros: no sangue, glicose, uréia, albumina e aspartato transaminase (AST) e no leite, proteína verdadeira, lactose e gordura. Os resultados demonstraram diferenças nos parâmetros metabólicos na glicose, uréia e gama glutamil transferase (GGT), entre os grupos L1 e vacas secas, enquanto para os compo¬nentes do leite a diferença foi observada entre a gordura e a proteína verdadeira, sendo mais alta no grupo L2...(AU)

Instability between the nutrients in animal organism, their biotransformation and final substances elimination can cause changes in the animal metabolism. The consequence of this condition are metabolical diseases, known also as production diseases. Several of these imbalances can cause subclinical diseases, that are difficult to perception, limiting the production of a persistent manner, causing a decline in production, which causes losses in the profitability of the producer and possible changes in the composition and quality of milk. The metabolic disorders can be detected by the study of biochemical profiles in the blood. The objective of this study was evaluating parameters of metabolic profile and milk in different categories of dairy herds in the Jersey breed in the southern of Rio Grande do Sul. Fifty nine Jersey cows were used from different properties of the southern region of Rio Grande do Sul, the females were divided into three groups: the first of cows (L1) with 7 to 80 days of lactation, the second (L2) with cows of 81 to 270 days of lactation and the third (dry cow) with cows from 45 to 10 days prepartum. Samples of blood and milk were collected and forwarded to the laboratory of the Federal University of Pelotas / Brazil, where the following parameters were measured: blood, glucose, urea, albumin and aspartate transaminase (AST) and in the milk true protein, lactose and fat. The results showed differences in metabolic parameters in glucose, urea and gama glutamil transferase (GGT), between groups L1 and dry cows, while the components of milk for the difference was observed between fat and the true protein, being highest in the group L2. None of the animals showed amendments that confirmed metabolic disease, even subclinical, but the differences were observed between the different productive periods, coming to confirm the various metabolic and nutritional needs for each productive stage of the animals(AU)

Assuntos

RESUMO

Desequilíbrios entre os nutrientes que ingressam no organismo animal, sua biotransformação e a eliminação das substâncias resultantes podem ocasionar alterações no metabolismo animal. A conseqüência direta dessa condição é a ocorrência das doenças metabó¬licas, também conhecidas como doenças da produção. Muitos desses desequilíbrios podem provocar doenças subclínicas que são de difícil percepção, limitando a produção de um modo persistente, provocando uma diminuição da produção, ocasionando perdas na rentabilidade do produtor e ainda possíveis alterações na composição e qualidade do leite. Os transtornos metabólicos podem ser detectados pelo estudo dos perfis bioquímicos no sangue. O objetivo deste estudo foi avaliar parâmetros do perfil metabólico e do leite em diferentes categorias de vacas leiteiras da raça Jersey em rebanhos do sul do Rio Grande do Sul. Foram utilizadas 59 vacas da raça Jersey de diferentes propriedades da região sul do Rio Grande do Sul, as fêmeas foram divididas em três grupos: o primeiro de vacas (L1) 7 a 80 dias de lactação, o segundo (L2) com vacas de 81 a 270 dias de lactação e o terceiro (vacas secas) com vacas de 45 a 10 dias pré¬parto. Amostras de sangue e leite foram coletadas e encaminhadas aos laboratórios da Univer¬sidade Federal de Pelotas/Brasil, onde foram mensurados os seguintes parâmetros: no sangue, glicose, uréia, albumina e aspartato transaminase (AST) e no leite, proteína verdadeira, lactose e gordura. Os resultados demonstraram diferenças nos parâmetros metabólicos na glicose, uréia e gama glutamil transferase (GGT), entre os grupos L1 e vacas secas, enquanto para os compo¬nentes do leite a diferença foi observada entre a gordura e a proteína verdadeira, sendo mais alta no grupo L2...

Instability between the nutrients in animal organism, their biotransformation and final substances elimination can cause changes in the animal metabolism. The consequence of this condition are metabolical diseases, known also as production diseases. Several of these imbalances can cause subclinical diseases, that are difficult to perception, limiting the production of a persistent manner, causing a decline in production, which causes losses in the profitability of the producer and possible changes in the composition and quality of milk. The metabolic disorders can be detected by the study of biochemical profiles in the blood. The objective of this study was evaluating parameters of metabolic profile and milk in different categories of dairy herds in the Jersey breed in the southern of Rio Grande do Sul. Fifty nine Jersey cows were used from different properties of the southern region of Rio Grande do Sul, the females were divided into three groups: the first of cows (L1) with 7 to 80 days of lactation, the second (L2) with cows of 81 to 270 days of lactation and the third (dry cow) with cows from 45 to 10 days prepartum. Samples of blood and milk were collected and forwarded to the laboratory of the Federal University of Pelotas / Brazil, where the following parameters were measured: blood, glucose, urea, albumin and aspartate transaminase (AST) and in the milk true protein, lactose and fat. The results showed differences in metabolic parameters in glucose, urea and gama glutamil transferase (GGT), between groups L1 and dry cows, while the components of milk for the difference was observed between fat and the true protein, being highest in the group L2. None of the animals showed amendments that confirmed metabolic disease, even subclinical, but the differences were observed between the different productive periods, coming to confirm the various metabolic and nutritional needs for each productive stage of the animals

Assuntos