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- Title
Effects of dietary supplementation with yeast chromium or dihydropyridine on milk composition and serum biochemical indices of periparturient dairy cows under heat stress.
- Authors
Zhang, L. W.; Zhang, Y. F.; Wang, C.; Wang, S. Q.; Zhang, S. B.; Li, J. D.; Gao, S.; Qi, Z. L.; Chen, H. J.
- Abstract
The objective of the current study was to evaluate the effects of dietary supplementation with chromium yeast (Cr-yeast) and dihydropyridine (DHP) on nutrient utilization, milk composition, and antioxidative status of prepartum dairy cows under heat stress. Twenty-four perinatal dairy cows (600 ± 14 kg; parity 2-3) were divided into three groups and fed the same basal diet with no supplement (control group), 8 g of Cr-yeast (Cr-yeast group), or 3 g of DHP (DHP group) per day. The experimental period consisted of a 7-d adaptation period and a 30-d data collection period from day 27 prepartum to day 3 postpartum. The temperature humidity index (THI) observed at daytime during the trial period exceeded 72, and the mean daily THI was 79.43. Norepinephrine in the Cr-yeast group decreased in prepartum cows. Serum cortisol in Cr-yeast or DHP group cows was lower in the postpartum period than in the control; however, serum cortisol levels decreased in the DHP group in the prepartum period. Dietary supplementation with Cr-yeast increased the digestibility of ether extract and the concentration of milk fat, while the solid non-fat (SNF) level was reduced. In the DHP group, the lactoprotein content was higher than the control. Total antioxidant capacity (T-AOC) was higher and the malondialdehyde (MDA) content tended to increase before calving in the Cr-yeast and DHP groups. Dietary supplementation with Cr-yeast or DHP can relieve the adverse impact caused by heat stress in prepartum dairy cows.
- Subjects
COMPOSITION of milk; DIETARY supplements; DAIRY cattle; DIHYDROPYRIDINE; OXIDANT status; PHYSIOLOGICAL effects of heat; LACTATION in cattle; NIACIN
- Publication
South African Journal of Animal Science, 2023, Vol 53, Issue 5, p637
- ISSN
0375-1589
- Publication type
Article
- DOI
10.4314/sajas.v53i5.03