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1.
Anim Nutr ; 7(4): 1024-1030, 2021 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-34738032

RESUMEN

This study aimed to evaluate role of nano-sized zinc (Zn) on lactation performance, health status, and mammary permeability of lactating dairy cows. Thirty multiparous dairy cows with similar days in milk (158 ± 43.2) and body weight (694 ± 60.5 kg) were chosen based on parity and milk production and were randomly assigned to 3 treatment groups: basal diet (control, 69.6 mg/kg of Zn adequate in Zn requirement), basal diet additional Zn-methionine (Zn-Met, providing 40 mg/kg of Zn), and basal diet additional nano-sized Zn oxide (nZnO, providing 40 mg/kg of Zn). The study lasted for 10 wk, with the first 2 wk as adaptation. Feed intake, milk yield and the related variables, and plasma variables were determined every other week. Blood hematological profiles were determined in the 8th week of the study. We found that feed intake, milk yield, and milk composition were similar across the 3 groups. The nZnO- and Zn-Met-fed cows had greater milk Zn concentrations in the milk (3.89 mg/L (Zn-Met) and 3.93 mg/L (nZnO)) and plasma (1.25 mg/L (Zn-Met) and 1.29 mg/L (nZnO)) than the control cows (3.79 mg/L in milk and 1.21 mg/L in plasma). The nZnO-fed cows had higher Zn concentrations in plasma but not in milk compared to Zn-Met-fed cows. The Zn appearance in milk was greater in nZnO-fed (area under curve during the first 4 h post-feeding for milk Zn: 16.1 mg/L) and Zn-Met-fed cows (15.7 mg/L) than in control cows (15.0 mg/L). During the first 4 h post-feeding, milk to blood Zn ratio was greater in nZnO-fed animals but lower in Zn-Met-fed cows compared with control cows. Oxidative stress-related variables in plasma, blood hematological profiles, and mammary permeability related variables were not different across treatments. In summary, lactation performance, Zn concentrations in milk and plasma, hematological profiles, mammary permeability were similar in cows fed nZnO and Zn-Met. We therefore suggested that nZnO feeding can improve Zn bioavailability without impairing lactation performance, health status, and mammary gland permeability in dairy cows.

2.
Anim Sci J ; 90(7): 894-902, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31025446

RESUMEN

The current study was conducted to investigate the effect of stocking density (SD) on oxidative stress status and mammary gland permeability in early lactating dairy cows. Thirty-two dairy cows were allocated into 16 blocks, basing on parity, previous milk yield, and body weight, and were then randomly assigned into one of the two treatments as follows: 75% (75SD) and 100% (100SD) SD. The cows were fed with same diet throughout the 8-week experimental period. The milk yield and milk sample were collected on two consecutive days during the 8-week experimental period weekly. Plasma samples were collected on fourth and eighth experimental weeks. Raw, energy-corrected, and 4% fat-corrected milk yield were significantly higher in 75SD-cows than that of 100SD-animals, respectively. The milk somatic cell count was lower in 75SD-cows than that of 100SD-animals. The levels of Na+ , Na+ /K+ , bovine serum albumin and plasmin were lower in 75SD-cows than those of 100SD-cattle, respectively. The 75SD-cows had reduced insulin and insulin/glucagon levels but higher prolactin and growth hormone concentrations, compared with those of 100SD-animals, respectively. In conclusion, compared with low SD-animals, early lactating cows with higher SD had higher oxidative stress status, which further led to a greater mammary gland permeability.


Asunto(s)
Bovinos/metabolismo , Bovinos/fisiología , Industria Lechera , Vivienda para Animales , Lactancia/fisiología , Glándulas Mamarias Animales/metabolismo , Estrés Oxidativo , Animales , Recuento de Células , Femenino , Fibrinolisina/metabolismo , Glucagón/metabolismo , Hormona del Crecimiento/metabolismo , Insulina/metabolismo , Leche/citología , Leche/metabolismo , Potasio/metabolismo , Prolactina/metabolismo , Albúmina Sérica Bovina/metabolismo , Sodio/metabolismo , Factores de Tiempo
3.
J Int Med Res ; 45(2): 843-848, 2017 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-28351282

RESUMEN

Objective This study aimed to assess the possible association of high breast milk sodium levels with postpartum depression and anxiety. Methods A total of 150 mothers and their healthy, exclusively breastfed newborns aged 8 to 15 days were recruited. Mothers were asked to complete scales for evaluation of postnatal depression and anxiety following an interview for consent and sociodemographic data collection. Breast milk samples were obtained to measure sodium and potassium (K) levels. Results Forty-nine mothers had higher than expected breast milk Na concentrations and a high Na/K ratio. These mothers scored significantly higher on the scales of postnatal depression and state anxiety ( P = 0.018 and P = 0.048, respectively). Conclusions This study shows that compared to normal breast milk Na levels and Na/K ratio, high breast milk Na and high Na/K ratio, with possible serious consequences in infants, are associated with maternal depressive and anxious symptoms in the postpartum period.


Asunto(s)
Ansiedad/diagnóstico , Depresión Posparto/diagnóstico , Leche Humana/química , Potasio/análisis , Sodio/análisis , Adolescente , Adulto , Ansiedad/metabolismo , Ansiedad/fisiopatología , Ansiedad/psicología , Lactancia Materna , Depresión Posparto/metabolismo , Depresión Posparto/fisiopatología , Depresión Posparto/psicología , Femenino , Humanos , Recién Nacido , Madres/psicología , Potasio/metabolismo , Proyectos de Investigación , Índice de Severidad de la Enfermedad , Sodio/metabolismo
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