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首页> 外文期刊>Tropical Animal Health and Production >Effect of bypass fat supplementation on productive and reproductive performance in crossbred cows
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Effect of bypass fat supplementation on productive and reproductive performance in crossbred cows

机译：补充旁路脂肪对杂交母牛生产和生殖性能的影响

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摘要

Objectives of the present study were to evaluate the effects of supplementation of bypass fat on milk production and reproductive performance of crossbred cows. Nineteen multiparous crossbred cows (2–4 lactation) were divided in two groups on the basis of most probable production ability (MPPA). The animals in group 1 (nine cows, MPPA 3,441.32 kg, control group G1) were fed chaffed wheat straw, chopped green maize, and concentrate mixture as per requirements while the animals in group 2 (10 cows, MPPA 3,457.2 kg, treatment group G2) were fed the same ration supplemented with 2.5% bypass fat (on DMI basis). The cows of G2 were supplemented bypass fat 40 days prepartum to 90 days postpartum and carry over effect of supplementation on milk production and reproductive parameters was monitored up to 210 days of lactation. Average birth weights of the calves were 24.94 and 27.95 kg in G1 and G2, respectively. The calving per cent in G1 (88.88%) was lower than that of G2 (100%). The time taken for expulsion of fetal membranes was decreased (P < 0.05) by 5.4 h in G2 compared to G1. Days required for involution of uterus was less (P < 0.05) in G2 (35.40 days) than that of G1 (49.44 days). Less number of cases of retention of fetal membranes (RFM) and metritis were observed in G2 as compared to that of G1. The average milk yield (210 days) in G2 was higher (P < 0.05) than that of G1 (18.65 vs 17.57 kg/day). Similarly, the milk yield during the carry over period (90 days) was higher (P < 0.05) in G2 than that of G1 (14.81 vs 13.79 kg/day). The time required for onset of cyclicity was reduced (P < 0.05) by 6.5 days in G2 as compared to that of G1. The service period and AI per conception were also reduced (P < 0.05) in G2 while bypass fat feeding showed no effect on conception rate (P < 0.80). There were no differences between the two groups in plasma cholesterol, progesterone and insulin concentrations. Hence, it was concluded that bypass fat supplementation at 2.5% of DMI increased the milk production and reduced the time required for involution of uterus and commencement of cyclicity. AI per conception, incidences of metritis and RFM were also reduced on supplementing bypass fat.
机译：本研究的目的是评估补充旁路脂肪对杂交奶牛产奶量和生殖性能的影响。根据最有可能的生产能力（MPPA），将19头多头杂交母牛（2-4泌乳）分为两组。第1组的动物（9头牛，MPPA 3,441.32公斤，对照组G1）按照要求喂入了麦草皮，切碎的青玉米和浓缩混合物，而第2组的动物（10头，MPPA 3,457.2公斤，治疗组G2 ）饲喂相同的日粮，添加2.5％的旁路脂肪（以DMI为基础）。在产前40天至产后90天，向G2奶牛补充旁路脂肪，并在哺乳期210天之前监测补充对奶产量的影响，并监测生殖参数。 G1和G2犊牛的平均出生体重分别为24.94和27.95 kg。 G1（88.88％）的产犊率低于G2（100％）。与G1相比，G2的胎膜排出时间减少了（P <0.05）5.4 h。 G2（35.40天）的子宫复旧所需天数少于G1（49.44天）（P <0.05）。与G1相比，在G2中观察到较少的胎膜（RFM）和子宫炎保留病例。 G2的平均产奶量（210天）比G1的平均产奶量高（P <0.05）（18.65比17.57 kg /天）。同样，G2的结转期（90天）中的产奶量高于G1（14.81比13.79 kg /天）（P <0.05）。与G1相比，G2中的周期性发作所需的时间减少了（P <0.05）6.5天。 G2组的服药时间和AI均降低（P <0.05），而旁路脂肪喂养对受孕率没有影响（P <0.80）。两组血浆胆固醇，孕酮和胰岛素浓度无差异。因此，得出的结论是，以DMI的2.5％补充旁路脂肪可以增加产奶量，并减少子宫复旧和开始循环所需的时间。补充旁路脂肪后，每胎AI，子宫炎和RFM的发生率也降低了。

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