亚热带条件下荷斯坦奶牛发情生产性能和繁殖性能的季节变化

M. M. Shabaan
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引用次数: 1

摘要

本研究旨在评估夏季和冬季热应激对荷斯坦奶牛生产和繁殖性能的影响。每个季节记录105 d的温湿度指数(THI)、直肠温度和呼吸率。每季连续5个月记录日产奶量(Kg/d)。在授精前后测定血清胆固醇、葡萄糖、尿素和孕酮(P4)浓度。每季测定首次授精受孕率(CR/AI)、总受孕率、单次授精服务次数(NSPC)和开放天数(DO)。THI值、直肠温度和呼吸速率夏季高于冬季。日产奶量冬季高于夏季(P<0.05)。在干燥期及GnRH和PGF注射时,夏季血清葡萄糖和尿素浓度高于冬季。然而,在GnRH和PGF注射期间,胆固醇在冬季升高。夏季注射GnRH对血清P4浓度无影响,而冬季注射GnRH使血清P4浓度升高。与夏季奶牛相比,更多的冬季奶牛怀上了第一个人工智能,每个概念需要的服务数量更少,并且开放的天数更少。
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Seasonal Changes in Productive and Reproductive Performance in Holstein Dairy Cows Synchronized for Estrus with the Ovsynch Protocol Under Subtropical Conditions
This study aimed to evaluate the effects of heat stress on productive and reproductive performances in Holstein dairy cows during summer compared to winter seasons. During each seasons, temperature– humidity index (THI), rectal temperature, and respiration rate were recorded for 105 days. Daily milk yield (Kg/day) was recorded for 5 consecutive months each season. Serum cholesterol, glucose, urea and progesterone (P4) concentrations were determined around the times of inseminations. Conception rate to first insemination (CR/AI), overall pregnancy rate, number of services per conception (NSPC) and number of days open (DO) were determined each season. Values of THI, rectal temperatures and respiration rate were greater in summer than winter. Daily milk yield was greater (P<0.05) in winter months compared to summer. Serum glucose and urea concentrations were greater in summer than winter during the dry period and at the times of GnRH and PGF injections. However, cholesterol was greater in winter during GnRH and PGF injection times. Serum P4 concentrations were not affected by GnRH treatment in summer, whereas GnRH injection increased P4 concentration during winter season. More winter cows conceived to first AI and required less number of services per conception and had fewer days open compared to summer cows.
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