Comparison on the Growth Characteristics between Calves of Two Different Japanese Beef Breeds Suckled by Japanese Shorthorn Dams

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
本文フルテキスト
The growth characteristics of five male Japanese Black calves that were produced by embryo transfer to, born from, and nursed by Japanese Shorthorn surrogate dams (BS-group) were compared with those of five male Japanese Shorthorn calves that were delivered from dams of the same breed after natural mating (SS-group). The birth weights of the BS-group calves were lower (P < 0.01) than those of the SS-group calves. During the first two months, the daily weight gain of the SS-group calves was greater (P < 0.05) than that of the BS-group calves. However, between the third and fourth months, the daily weight gain of the BS-group calves was greater (P > 0.05). During the first two months, the chest girth was smaller (P < 0.05) in the BS-group calves than in the SS-group calves, but was similar in both groups by the age of four months. Although the gains in chest depth, body length, and withers height of the BS-group calves were inferior to those of the SS-group calves during the first two months, these gains were all superior to those of the SS-group calves during the next two months. Trends in age-related changes in plasma total cholesterol concentrations significantly differed between both groups. The SS-group dams lost much more weight during early lactation than did the BS-group dams (P > 0.05). No difference was observed in the blood components of the dams in either group. In summary, the BS-group calves were relatively small at birth, and their growth performance was inferior to that of the SS-group calves during the first two months. At around two months of age, the Japanese Black embryo-transfer calves began to suckle larger amounts of milk from their surrogate dams and showed rapid growth that was comparable to that of larger framed Japanese Shorthorn calves.
刊行年月日
作成者 Manabu YAMAGUCHI Akira WATANABE Naoki TAKENOUCHI Hiroyuki SUZUKI Masatoshi MATSUZAKI
著者キーワード

cow-calf grazing

Japanese Black cattle

lactation

Wagyu

weight gain

公開者 Japan International Research Center for Agricultural Sciences
受付日 2018-08-10
受理日 2019-05-21
54
1
開始ページ 93
終了ページ 100
DOI 10.6090/jarq.54.93
言語 eng

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