RESUMO
Although studies have shown positive effects of gonadotropin releasing hormone (GnRH) or prostaglandin F2α (PGF2α) at the moment of fixed-time artificial insemination (FTAI) in the conception rate (CR) of cattle, its effects on treatments based on progesterone (P4) and estradiol benzoate (EB) is still not conclusive. The objective of this study was (1) to evaluate the effect of a PGF2α analogue at FTAI in the CR of crossbred beef cows submitted to a 11d FTAI protocol based on P4 and EB; and (2) to describe the CR between PGF2α-treated and control cows in different body condition scores (BCS) and parity categories. Crossbred (½ Nellore and ½ Angus) beef cows were submitted to a synchronization protocol and randomly assigned into 2 groups: Control (n = 163), at FTAI cows received 2 mL of saline solution as a placebo, and PGF2α (n = 163), at FTAI cows were treated with PGF2α analogue (10 mg of dinoprost tromethamine). Pregnancy diagnosis was performed 33d post-FTAI. Binary logistic regression model was used to analyze the effect of PGF2α treatment on CR. There was no difference in CR between PGF2α and control groups (P > 0.05; odds ratio (OR) = 0.92; confidence interval (CI) = 0.59-1.4). A greater CR was found in heifers (P = 0.0006, OR = 2.65, CI = 1.61 - 4.38) and multiparous (P = 0.0006, OR = 2.12, CI = 1.04 - 4.3) when compared to primiparous cows. Cows with low BCS (4; 9-point scale) showed lower CR when compared with moderate BCS (5-6; 9-point scale) (P < 0.05; OR = 0.10; CI = 0.06 - 0.18). There was no numerical difference on CR between PGF2α-treated and control cows in different BCS and parity categories. The results suggested that the CR in this study was not influenced by 10 mg PGF2α analogue at FTAI.
RESUMO
Although studies have shown positive effects of gonadotropin releasing hormone (GnRH) or prostaglandin F2α (PGF2α) at the moment of fixed-time artificial insemination (FTAI) in the conception rate (CR) of cattle, its effects on treatments based on progesterone (P4) and estradiol benzoate (EB) is still not conclusive. The objective of this study was (1) to evaluate the effect of a PGF2α analogue at FTAI in the CR of crossbred beef cows submitted to a 11d FTAI protocol based on P4 and EB; and (2) to describe the CR between PGF2α-treated and control cows in different body condition scores (BCS) and parity categories. Crossbred (½ Nellore and ½ Angus) beef cows were submitted to a synchronization protocol and randomly assigned into 2 groups: Control (n = 163), at FTAI cows received 2 mL of saline solution as a placebo, and PGF2α (n = 163), at FTAI cows were treated with PGF2α analogue (10 mg of dinoprost tromethamine). Pregnancy diagnosis was performed 33d post-FTAI. Binary logistic regression model was used to analyze the effect of PGF2α treatment on CR. There was no difference in CR between PGF2α and control groups (P > 0.05; odds ratio (OR) = 0.92; confidence interval (CI) = 0.59-1.4). A greater CR was found in heifers (P = 0.0006, OR = 2.65, CI = 1.61 - 4.38) and multiparous (P = 0.0006, OR = 2.12, CI = 1.04 - 4.3) when compared to primiparous cows. Cows with low BCS (4; 9-point scale) showed lower CR when compared with moderate BCS (5-6; 9-point scale) (P < 0.05; OR = 0.10; CI = 0.06 - 0.18). There was no numerical difference on CR between PGF2α-treated and control cows in different BCS and parity categories. The results suggested that the CR in this study was not influenced by 10 mg PGF2α analogue at FTAI.(AU)
Assuntos
Animais , Feminino , Bovinos/fisiologia , Inseminação Artificial/veterinária , Dinoprosta/uso terapêutico , Modelos LogísticosRESUMO
O objetivo deste trabalho foi avaliar o manejo pré-abate de bovinos em um abatedouro frigorífico de Uberlândia MG, quanto às adequações para um abate humanitário. Foram realizadas 6 visitas ao estabelecimento, onde se coletou informações referentes à 1011 bovinos (uso de choque elétrico, escorregões, quedas, e taxas de lotação dos currais). A primeira visita apresentou a menor proporção de estímulos elétricos por animal (1,56) e a sexta visita a maior frequência (2,98). Os menores valores de escorregão e queda obtidos foram nos currais com frequência respectiva de 1,68% e 0,79%. Não houve relação entre o excesso de animais em um determinado compartimento e o número de quedas, escorregões e choques (p>0,05). O estabelecimento se adequou em partes à legislação, porém, ajustes podem contribuir para a melhor qualidade do manejo.(AU)
Assuntos
Animais , Bovinos , Bem-Estar do Animal , Abate de Animais , Matadouros , Brasil , Inspeção SanitáriaRESUMO
O objetivo deste trabalho foi avaliar o manejo pré-abate de bovinos em um abatedouro frigorífico de Uberlândia MG, quanto às adequações para um abate humanitário. Foram realizadas 6 visitas ao estabelecimento, onde se coletou informações referentes à 1011 bovinos (uso de choque elétrico, escorregões, quedas, e taxas de lotação dos currais). A primeira visita apresentou a menor proporção de estímulos elétricos por animal (1,56) e a sexta visita a maior frequência (2,98). Os menores valores de escorregão e queda obtidos foram nos currais com frequência respectiva de 1,68% e 0,79%. Não houve relação entre o excesso de animais em um determinado compartimento e o número de quedas, escorregões e choques (p>0,05). O estabelecimento se adequou em partes à legislação, porém, ajustes podem contribuir para a melhor qualidade do manejo.