EFFECT OF EARLY REARING EXPERIENCE ON SUBSEQUENT BEHAVIOR AND PRODUCTION OF HOLSTEIN HEIFERS
EFFECT OF EARLY REARING EXPERIENCE ON SUBSEQUENT BEHAVIOR AND PRODUCTION OF HOLSTEIN HEIFERS
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DOI：
10.3168/jds.s0022-0302(85)80910-3
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发表时间：
1985-01-01
影响因子：
3.5
通讯作者：
WALTERS, JL
中科院分区：
文献类型：
--
作者：
ARAVE, CW;MICKELSEN, CH;WALTERS, JL
小母牛 (67) 出生时被分配到 4 种饲养处理中的一种：每组 6 只，单独饲养，隔离和隔离处理（每天与犊牛饲喂器互动 10 分钟）。小牛采用相同的饮食，除了组小牛外，其他小牛的饮食均相同，为 1.2 倍。 2.4 m 笼舍。群犊牛饲养在开放式棚舍中，每头犊牛面积为 3 平方米。小牛在 .apprx 断奶。 10 周，然后融入正常的牛群日常活动。断奶时连续 3 天对每头犊牛进行 3 分钟的露天饲养。在旷场测试之前和之后采集血浆糖皮质激素样本。小母牛 (48) 每天挤奶两次，完成 305 天的哺乳期。断奶体重或断奶平均日增重没有差异。在野外测试中，各组小牛排尿和叛逃的情况更多，但发声次数没有差异。所有小牛的糖皮质激素均显着增加，但治疗效果为零。隔离饲养的奶牛产奶量显着增加（922 公斤 3.5% 脂肪校正奶），在相对奶量方面具有 1205 公斤的优势，但在相对乳脂方面与群体或单独饲养的奶牛没有差异。
Heifer calves (67) were assigned at birth to 1 of 4 rearing treatments: groups of 6, individual hutch, isolation and isolation with handling (10 min daily interaction with calf feeder). Calves were on the same diet and except for group calves were in 1.2 .times. 2.4 m hutches. Group calves were in open shed housing with 3m2/calf. Calves were weaned at .apprx. 10 wk and then assimilated into regular herd routine. An open field cost of 3 min for each calf was conducted on 3 consecutive days at weaning. Samples for blood plasma glucocorticoids were taken before and after open field testing. Heifers (48) milked twice daily completed 305 day lactations. There were no differences in weaning weight or average daily gain to weanng. Group calves urinated and defected more during open field tests, but number of vocalizations was not different. There was a significant rise of glucocorticoids for all calves, but treatment effects were nil. Cows reared in isolation produced significantly more milk (922 kg 3.5% fat-corrected milk), had a 1205 kg advantage in relative milk but were not different from group or individually reared cows in relative milk fat.