Siyah alaca sığırlarda yaşama gücü, dölverimi ve süt verimi özelliklerini etkileyen bazı çevresel faktörler üzerinde araştırmalar
Başlık çevirisi mevcut değil.
- Tez No: 37810
- Danışmanlar: PROF.DR. AHMET ALTINEL
- Tez Türü: Doktora
- Konular: Veteriner Hekimliği, Veterinary Medicine
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1994
- Dil: Türkçe
- Üniversite: İstanbul Üniversitesi
- Enstitü: Sağlık Bilimleri Enstitüsü
- Ana Bilim Dalı: Zootekni Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 91
Özet
80 inseminations per conception, as 2.4; gestation length, as 279.2 days and calving interval, as 419.0 days. The lactation length, the actual and 305 day milk yields that were calculated according to milking 3 times a day and dry period means were determined as 349.87 days, 61 11.16 kg, 5527.96 kg and 71.8 days, respectively. The effects of the year of calving, the age of dam, sex of calves and the season of calving on calf livability were studied. The effects of this factors on the 0-30 day calf livability rates were found to be insignificant. Neverthless, the factors of age of dam and season of calving had effects on the 0-90 day calf livability rates. Also, it was found that the factors of year of calving, age of dam and season of calving effected the 0-180 day calf livability rates. The year of insemination or calving was found to be effective on the pregnancy rate, the infertility rate, the pregnancy rate in the first breeding, the age at first calving, the interval from calving to first insemination, the days open, the interval from first insemination to conception, the number of inseminations per conception and the calving interval. Furthermore, it was found that the order of pregnancy had effects on the pregnancy rate, the infertility rate, the normally calving rate and the number of inseminations per conception. The season of insemination or calving were found to be effective on the pregnancy rate, the infertility rate, the pregnancy rate in the first breeding, the interval from calving to first insemination, the interval from first insemination to conception, the days open, the calving interval and the gestation length. The effects of the year of calving on the lactation length, the actual and 305 day milk yields were found to be statistically significant in the level of P
Özet (Çeviri)
81 of P
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