Reproductive performance in Japanese Black cows following feeding method changes at Fuji [Japan] Farm, Tokyo University of Agriculture
2010
Noguchi, T., Tokyo Univ. of Agriculture, Atsugi, Kanagawa (Japan). Faculty of Agriculture | Sato, M. | Kurosawa, A. | Ikeda, S. | Sukemori, S. | Watanabe, T.
Research has been carried out on how to improve feeding methods for domestic animals since 1987 at Fuji farm, Tokyo University of Agriculture. In this investigation, the days consumed for the first postpartum artificial insemination, the number of artificial inseminations, the conception rate, and the relation of days of the non-pregnancy in a total of 400 Japanese Black cows fed between 1987 to 2006 were analyzed along with the transition of feeding method. Conception rates were 50.6% with the early cow separation and it was higher than that (44.8%) of natural nursing period. Days of non-pregnancy during raising time in the cattle shed were 120.3 +- 90.6, though it was 90.0 +- 72.3 days after the start of pasturing, approximately 30 days shorter, with a significant difference (P0.05). Natural nursing period was 125.1 +- 94.8, and it was 88.1 +- 62.0 days after the start of early cow separation, approximately 37 days shorter with a significant difference (P0.05). As a result, we thought that feeding in the livestock barn between 1987 to 2001, in which cows were not able to move around adequately and that making the cow separation time earlier from 2001 and the expansion of the pasture area had exerted an excellent influence on conception rate improvement and the shortening of non-pregnancy days.
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