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Growth, reproduction and herbage utilization in Japanese Black and Brahman sired crossbred cow and their calves

日本黑婆罗门杂交牛及其犊牛的生长、繁殖和牧草利用

基本信息

批准号：
01560283
负责人：
YAMAGISHI Toshihiro
金额：
$ 1.02万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01560283/
关键词：
Beef cattle Brahman Crossbreeding Grazing ability Digestibility Suckling Behavior Growth 放牧適性枝肉形質皮下脂肪

项目摘要

This study was carried out to examine whether introduction of the germ plasm of Brahman breed was effective or not for increasing the grazing ability, herbage utilization and growth potential of Japanese beef cattle.l. Herbage utilization in grazing was evaluated for F_1 of Brahman(Z)* X Japanese black(B), Japanese Shorthorn(N)and Holstein(H)* and BB cows. F_1 exceeded BB in herbage intake per metabolic body weight. F, was larger in both intakes of NDF and TDN per body weight than BB, supporting from differences of their contents(%)within herbage in pasture before and after grazing.2. In milk yield estimated by weig-suckle-weigh method of calves, Z-H, ZN and NN were largest and BB was smallest, ZB and BN were intermediate. These indicated that effects of breed on milk yield were larger in dam breed than in sire breed. Average daily gains(ADG)of calves from dam groups were largest in ZH, ZN and NN and smallest in BB, ZB and BN were intermediate. ADG was corresponding to milk yield of dam.3. ADG, herbage utilization and behavior in grazing were evaluated for calves of 1/4 Z(BB* X ZB, ZN, ZH*)and BB. 1/4 Z was larger in both of ADG and herbage intake per metabolic body weight than BB. There were no differences in dry matter and protein digestibilities between two groups, but 1/4 Z tended to be, respectively, higher in fiber digestibility and longer in grazing time than BB. It was suggested from these results that 1/4 Z had more nutrient intakes during grazing than BB.These results demonstrated that(1)Brahman crossbred F, was superior to Japanese beef breeds, especialy Japanese Black in grazing ability, (2)these characteristics were existing in 1/4 Brahman crossbred calves.

本试验旨在探讨引进婆罗门品种种质对提高日本肉牛的放牧能力、牧草利用率和生长潜力是否有效。对婆罗门(Z) × X日本黑(B)、日本短刺(N)、荷斯坦(H) ×和BB牛F_1进行放牧牧草利用评价。F_1每代谢体重采食量超过BB。饲粮中NDF和TDN的摄取量均大于BB，这与放牧前后牧草中NDF和TDN含量（%）的差异有关。犊牛体重-乳重法估算的产奶量中，Z-H、ZN和NN最大，BB最小，ZB和BN居中。说明品种对母种产奶量的影响大于母种。坝组犊牛平均日增重以ZH、ZN和NN组最大，BB组最小，ZB和BN组居中。平均日增重与奶牛产奶量相对应。评价1/4 Z（BB* X ZB、ZN、ZH*）和BB犊牛的平均日增重、牧草利用和放牧行为。1/4 Z的平均日增重和牧草采食量均大于BB。两组干物质消化率和蛋白质消化率无显著差异，但1/4 Z的纤维消化率和放牧时间分别高于BB。综上所述，1/4 Z在放牧期间的营养摄入量高于BB。结果表明：(1)婆罗门杂交种F，放牧能力优于日本牛肉品种，特别是日本黑牛；(2)1/4婆罗门杂交种犊牛均具有上述特点。