Reproduction and Production Performances of Imported Holstein Cows from Canada
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Abstract
Total of 4,213 records of 103 imported Holstein cows from Canada, extending over a period of 8 years (1990-1997) were collected from the herd maintained at Chiang Mai Livestock Research and Breeding Center. The overall average age at first calving, birth weight, services per conception, gestation period, days open and calving interval were 852.62±110.88 days, 37.47±5.89 kg, 2.75 ± 1.96, 279.68±5.35 days, 201.11±124.26 days and 479.35±126.52 days, respectively. The overall total milk yield, 100-d milk yield, 305-d milk yield, mature equivalent 305-d milk yield (ME milk) and 305-d 4% FCM were 7,074.59 ± 2,073.23, 2,651.79 ± 465.09, 6,549.56±1,287.46, 7,360.34 ±1,365.18 and 6,221.01±1,177.25 kg, respectively. The lactation length was averaged 348.72±85.85 days. Percentage of milk fat and milk protein were 2.98 ± 0.49 and 3.19 ± 0.21. Fat yield and protein yield were 214.27±103.05 and 228.32 ±73.11 kg. The lactation number was significantly (P<0.01) effected on services per conception, dry period, total milk yield, 100-d milk yield, 305-d milk yield, milk fat, milk protein and protein yield. Moreover, ME milk and 305-d 4% FCM milk yield were significantly influenced (P<0.05) by lactation number. The effect of calving season on calving interval, days open and 100-d milk yield was found to be significant (P<0.01). The services per conception was also significantly influenced (P<0.05) by season of calving. The effect of age at first calving on calving interval and milk fat was significant (P<0.05). The dry period was also significantly influenced (P <0.01) by age at first calving.
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