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The first lactation in three generations of Holstein-Friesians and Brown Swiss in Maracay, Venezuela


, : The first lactation in three generations of Holstein-Friesians and Brown Swiss in Maracay, Venezuela. Agronomia Tropical 27(6): 591-600

For 37 Holstein-Friesian and 43 Brown Swiss cows, imported into Venezuela from the USA in 1964, age at 1st calving averaged 32.6 and 33.7 mth resp., body weight at 1st calving 424.5 and 440.7 kg, length of 1st lactation 329.8 and 356.4 days, 1st-lactation milk yield 3205.6 and 3416.0 kg, fat percentage 3.62 and 3.90, the number of services required/conception 2.90 and 3.16, and length of 1st service period 236.9 and 237.9 days.

US$29.90


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