Breeding efficiency in cows and Egyptian buffaloes: Number of services per conception [electronic resource].

Includes reference.

Data were collected from 1552 reproductive records of 318 Friesian crossbred cows and 230 Egyptian buffaloes belonging to Faculty of Agriculture, University of Alexandria, Egypt over a period of 15 years started in 1970. The effects of year of breeding, month and season of breeding, post partum first service, days open, parity, age of parents and sire effect on the number of services required for conception (NS/C) were studied. The results obtained could be summarized in the following: 1-Year of breeding had significant (P<0.01) effect on NS/C for cows and buffaloes and it ranged from 10 to 3.2. 2-The lowest NS/C appeared in spring and autumn seasons of breeding and the highest values were in summer and winter. Both month and season of breeding had significant effect in cows but non Significant for buffaloes in this respect. 3-Buffalo and cow females having post partum period less than 3 months required more NS/C and then it decreased for those having a period (3-<6months). The effect of post partum period on NS/C was Significant (P<001) in buffaloes but non Significant in cows. 4-The average NS/C tended to increase significantly (P<0.01) as days open increased in both species.

Summary in Arabic.

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