© 2006 Universidad Nacional Mayor de San Marcos. All rights reserved. A reproductive study was conducted in the El Mantaro valley, Junín, Peru. Forty milking cows from 6 farms were monitored during the rainy season. The effect of breed, parity, milk yield, farm, and technological level on the interval from calving to first ovulation (CFOI), to first service (CFSI), and to conception (CCI) were evaluated. CFOI was determined through progesterone radioimmunoassayconcentration in defatted milk. CFOI was within the expected range for dairycattle (41.2 ± 20.2 days); however, CFSI (118.4 ± 69.2) and CCI (171.3 ± 105.5 days) were too long, possibly due to heat detection failures and nutritional constraints. Farm technological level was the onlyvariable of importance that affected CFSI.
|Original language||American English|
|Number of pages||6|
|Journal||Revista de Investigaciones Veterinarias del Peru|
|State||Published - 1 Jan 2006|