Establishment of the technique of whole year grazing of Japanese Black cow in simple barn (the 1sup(st) report)
2018
Ikeda, N. | Sasaki, K.
Japanese Black cattle were grazed whole year in the simple barn using a greenhouse, determining growth and reproductive performance of cows, condition of the grassland, weatherability of the greenhouse and growth of calves. In the rearing period, cows were fed 1 kg/day of concentrated feed when grazing, and fed concentrated feed, 2 kg/day of timothy grass hay and plenty of silage of Italian ryegrass in winter. The amounts of concentrated feed were increased up to 3 kg/day before artificial insemination and calving, and after calving. As the results, the weights of cows were raised in the range of the standard growth curve of Japanese black cow. The average number of times of artificial insemination was 1.5 ± 0.87 times and that of the age fertilized was 15.4 ヵ± 1.04 month old, and these numbers were almost equivalent to the average in Japan. The average weight of calves at birth was 38.7 ± 7.1 kg. Some countermeasure to prevent death of calves such as enforcing careful observation of calves since there was a case of death of a calf due to inadequate feeding. With regard to weatherability of the greenhouse as a simple barn, there was no damage to the greenhouse by typhoon No. 21 (the maximum wind speed 21.3 (m/s)) on October 23sup(rd), 2017 apart from some small damage on band for wall of greenhouse. The greenhouse in Nishibessho was collapsed because of snow (175 cm of snow in the end, 90 cm of snow 2 nights before collapse). The greenhouse in Hamaji was not damaged by snow whereas there was 80 cm of snow in Hamaji and 170 cm of snow along the wall of the greenhouse at a maximum.
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