Responses of energy balance, physiology, and production for transition dairy cows fed with a low-energy prepartum diet during hot season
文献类型: 外文期刊
第一作者: Su, Huawei
作者: Su, Huawei;Su, Huawei;Wang, Yachun;Wang, Fuwei;Cao, Zhijun;Rahman, Muhammad Aziz Ur;Cao, Binghai;Li, Shengli;Zhang, Qian
作者机构:
关键词: China;Dairy cow;Hot season;Energy balance;Physiology;Milk production
期刊名称:TROPICAL ANIMAL HEALTH AND PRODUCTION ( 影响因子:1.559; 五年影响因子:1.681 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Twenty multiparous Chinese Holstein dairy cows calving in hot summer (S group), were compared with 20 similar control cows calving in cool autumn (C group). Diets were the same for both groups; prepartum diets had relatively low energy density. Average temperature-humidity index was 76.5 and 53.0 in summer and autumn, respectively. S group cows had significantly higher rectal temperatures (39.6 vs. 39.0 A degrees C) and respiration rates (79.0 vs. 31.3 breaths/min) than C group, and consumed less feed (prepartum 8.0 vs. 12.3 kg/day, postpartum 16.3 vs. 21.2 kg/day). Calculated energy balance (EB) was -7.98 vs. -5.15 Mcal/day for S group prepartum and postpartum, respectively. In contrast, EB was 1.36 vs. -2.03 Mcal/day for C group prepartum and postpartum, respectively. S group produced significantly less milk than C group by 15.4 % (5.2 kg/day) and 26.8 % (10.2 kg/d) for milk yield and energy-corrected milk, respectively. Percentages of milk fat (3.28 vs. 4.29 %), protein (3.08 vs. 3.33 %), and solids-not-fat (8.46 vs. 8.78 %) were significantly lower for S group. Milk urea nitrogen (19.54 vs. 13.31 mg/dL) was significantly higher in S group. Significantly lower feed efficiency was observed in S group (1.56 vs. 1.66). During the entire transition period, S group had significantly lower circulating glucose levels. S group had significantly higher levels of nonesterified fatty acids (NEFA) prepartum, but after 14 days in milk, NEFA was significantly lower. We conclude that increasing dietary energy density during transition period (especially prepartum) is necessary to minimize adverse effects of hot season.
分类号: S8
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