Some factors affecting embryonic loss in Friesian cattle
Abstract: A total of 755 Friesian heifers and 1750 cows breeding records were analyzed, covering the period from 1979 to 1999 to point out some factors affecting embryonic loss in Friesian cattle raised at Sakha (Farm 1) and El-Karada (Farm 2). The results indicated that, age of either heifers or cows had significant effect on embryonic loss. Rate of embryonic loss increased in July, August, September and October. Month of the year had highly significant (P<0.001) effect on the number of services per conception. The first parity recorded the highest embryonic loss percent (16.6%). Parity had highly significant (P<0.001) effect on the number of services per conception in cases of embryonic loss. The farm has no effect on the embryonic loss incidence of both heifers arid cows. Calving interval was significantly (P<0.005) affected by embryonic loss. The effect of sire on incidence of embryonic loss was significant in heifers, however. the sire had no effect in cows. On the other hand, sire had highly significant (P<0.001) effect on calving interval for cows that lost their embryo. The heritability for embryonic loss was higher in heifers (0.37) than in cows (0.04). The heritability for the number of services per conception for both heifers and cows having embryonic loss were higher in heifers than in cows and it mounted 0.31 and 0.14, respectively. The heritability of calving interval for cows that lost their embryo was (0.23). The overall mean of calving interval for cows having embryonic loss was 389.1±12.0 days. The present results indicated that, the reducing or restricting of previous factors led to improvement the reproductive performance of dairy cattle. The development of the reproductive efficiency reflected on increasing the economic efficiency of herds.
Key Word: Embryonic loss, Calving interval, Friesian Cattle.
Publication year 2002
Pages 1-15
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
serial title Egyptian Journal Basic and Applied Physiology
Author(s) from ARC
Agris Categories Animal husbandry
AGROVOC
TERMS		 Cattle. Cows. Fathers. Heifers. Mortality. Parturition interval.
Proposed Agrovoc Friesian Cattle;
Publication Type Journal
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