The 6-month study involved 244 farms and 21 780 Italian Friesian cows. The distribution of cows in parities 1-8 was 29.0, 23.3, 17.7, 12.2, 7.8, 4.8, 2.8 and 1.4% resp. The calving interval averaged 401.2 days, the service period 117.6 days, and the number of inseminations per conception 1.8. The Fertility Status Index, as proposed by Esslemont [ British Veterinary Journal 133, 346] averaged only 33.6%. The CR, insemination index and service period were all significantly better on smaller compared with larger farms, and on farms with lower rather than higher milk yield.
Alcune considerazioni sulla situazione riproduttiva negli allevamenti di bovine da latte in provincia di Milano.
Pizzi F;
1986
Abstract
The 6-month study involved 244 farms and 21 780 Italian Friesian cows. The distribution of cows in parities 1-8 was 29.0, 23.3, 17.7, 12.2, 7.8, 4.8, 2.8 and 1.4% resp. The calving interval averaged 401.2 days, the service period 117.6 days, and the number of inseminations per conception 1.8. The Fertility Status Index, as proposed by Esslemont [ British Veterinary Journal 133, 346] averaged only 33.6%. The CR, insemination index and service period were all significantly better on smaller compared with larger farms, and on farms with lower rather than higher milk yield.File in questo prodotto:
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