ArticleTropical animal health and production2026
Effects of antioxidant and calcium slow-release boluses administration on metabolic status, production, and reproductive performance of dairy cows during the summer season.
Article in Tropical animal health and production, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study aimed to assess the effects of feeding slow-release boluses of antioxidant and/or calcium on calcium homeostasis, productive and reproductive performance in high-producing dairy cows during the summer season. At the beginning of the close-up period, two hundred multiparous dairy cows were divided into two groups of with (+ A) or without (-A) antioxidant slow-release bolus administration. Then, each of the two initial groups was further divided into two subgroups of with (+ C) or without (-C) calcium slow-release bolus. Therefore, the experimental groups were + A + C, +A-C, -A + C, and -A-C during postpartum period (50 cows per group). The results indicated that + A reduced serum non-esterified fatty acids (NEFA) and NEFA: Albumin ratio during prepartum period (P = 0.03). Moreover, the + A cows had higher serum beta-hydroxy butyrate (BHBA), lower cholesterol, and alanine transferase during the postpartum period (P < 0.05). On the other hand, the + C cows had lower serum BHBA, and aspartate aminotransferase throughout the postpartum period (P < 0.05). The cows in group + C had higher milk yield, fat and energy corrected milk, milk fat, and protein content but lower somatic cell count than -C cows postpartum (P < 0.05). The treatments of + C and + A had shorter days to the onset of ovarian activity and uterine involution compared with -C and -A cows (P < 0.05). In conclusion, administration of slow-release calcium boluses improve production performance while its combination with antioxidant bolus seems to be a promising strategy for improving the metabolic and reproductive status of dairy cows during heat stress.
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