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Maternal Effects of Japanese Shorthorn Cows on the Growth of Embryo-transferred Japanese Black Calves in a Cow-calf Grazing System

  • Yamaguchi, Manabu (Livestock and Forage Research Division, Tohoku Agricultural Research Center, National Agriculture and Food Research Organization (NARO)) ;
  • Ikeda, Kentaro (Livestock and Forage Research Division, Tohoku Agricultural Research Center, National Agriculture and Food Research Organization (NARO)) ;
  • Takenouchi, Naoki (Livestock and Forage Research Division, Tohoku Agricultural Research Center, National Agriculture and Food Research Organization (NARO)) ;
  • Higashiyama, Masakazu (Livestock and Forage Research Division, Tohoku Agricultural Research Center, National Agriculture and Food Research Organization (NARO)) ;
  • Watanabe, Akira (Livestock and Forage Research Division, Tohoku Agricultural Research Center, National Agriculture and Food Research Organization (NARO))
  • Received : 2013.01.15
  • Accepted : 2013.03.07
  • Published : 2013.07.01

Abstract

The growth performance of embryo-transferred Japanese Black calves that were born from, and suckled by, Japanese Shorthorn cows in a cow-calf grazing system (BS-group, n = 5) was compared to that of Japanese Black calves from Japanese Black cows in a cowshed (BB-group, n = 5). The daily weight gain from birth to 1 month was higher in the BS-group than in the BB-group (p<0.01), and the same trend (p<0.05) was observed at 2 and 3 months of age. This resulted in body weight that was significantly higher for the BS-group between 1 and 3 months of age than what was observed for the BB-group (p<0.05). Heart girth was significantly greater in the BS-group than in the BB-group throughout the experimental period (p<0.01), and chest depth and withers height in the BS-group were significantly greater from 2 to 4 months of age (p<0.05) and at 4 months of age only (p<0.05). No difference in body length (p>0.05) was observed between the groups. These results suggest that the maternal effect of Japanese Shorthorn cows was positive for embryo-transferred Japanese Black calf growth during the early suckling stage. As Japanese Black calves are traded at a high price on the Japanese market, we conclude that this proposed production system is likely to improve the profitability of herd management in upland Japan.

Keywords

References

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