Reproductive performance of imported Sahiwal-Holstein crosses in the Philippines under three management systems
2001
Arganosa, A.S. | Trung, L.T. | Rigor, E.M.
Breeding records of 289 Sahiwal-Holstein crosses imported as pregnant heifers in two batches and raised under smallhold, semi-commercial and commercial systems were analyzed. Reproductive performance of the animals in the smallhold and semi-commercial groups from the first and second importations was evaluated. In the first importation, calving interval was 546.6 + 11.1 days compared with 414.7 + 8.2 days for the second importation (P0.05). Interval from first breeding to conception and services per conception were the same for both importations. Within the second batch, interval from calving to first breeding for smallhold cattle was 115.3 + 7.4 days, for the semi-commercial 47.5 + 3.3 days and for commercial, 92.6 + 6.9 days (P0.05). Interval from first breeding to conception for the smallhold group (79.7 + 9.9 days) was greater (P0.05) than the semi-commercial (18.3 + 4.5 days) and commercial (32.0 + 9.3 days) groups. The differences in the interval from calving to first insemination and interval from first insemination to conception were reflected in a service period of 195.0 + 11.4 days for smallhold, 65.8 + 4.8 days for semi-commercial and 124.6 + 11.6 days for commercial (P0.05). Overall service period was 133.3 + 6.9 days which is longer by 48.3 days than the accepted service period for dairy cattle. Calving intervals for the three systems are a reflection of the service period, with the semi-commercial having the shortest followed by the commercial and the smallhold (P0.05). Number of services per conception for the smallhold (2.3) was greater (P0.05) than that of the semi-commercial and commercial (both with 1.5). Calving rate to first insemination for a limited number of animals for the commercial (5.7 + .5%) was higher (P0.05) than that of smallhold (21.0 + 3.2%)
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