Livestock Studies 1968, Vol 8, Num, 1-2     (Pages: 017-028)

İVESİ KOYUNLARINDA BAZI ÇEVRE FAKTÖRLERİNİN SÜT VERİMİNE ETKİSİ VE SELEKSİYONDA KISMİ SÜT KAYITLARINDAN FAYDALANMA İMKANLARI ÜZERİNDE BİR ARAŞTIRMA

Bekir ÖZCAN ,Şerif KAYMAZ

- Effect of age of ewe, date of lambing and length of lactation on milk production and the value of partial records for estimating lactation milk production have been investigated using 1030 lactation records from Awassi flock at Çukurova State Farm.

Milk production increases up to 4 – 5 years of age and there after shows a gradual decline. Effect of age was found to be statistically significiant; age correction factors have been calculated and tabulated. Date of lambing dit not influence milk production significantly (r= - 0.04) but correlation between length of lactation and milk production was fairly high (0.52).

Correlations between milk production (estimated from 2 weekly controls) and amount of milk at the first three controls, between milk production and maximum daily milk yield, and between milk production values estimated from 2 – and 4 – weekly controls were 0.76, 0.69 and 0.99, respectively. The use of these relationships in selecting for milk production is discussed. Keywords :