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Reproductive performance of purebred and crossbred Zebu cattle under artificial insemination in the Amazon tropics

Published online by Cambridge University Press:  02 September 2010

M. Garcia ,
W. Huanca  and
L. Echevarria
M. Garcia
Affiliation:
Veterinary Institute for Tropical and High Altitude Research (IVITA), University of San Marcos, Box 4270, Lima, Peru
W. Huanca
Affiliation:
Veterinary Institute for Tropical and High Altitude Research (IVITA), University of San Marcos, Box 4270, Lima, Peru
L. Echevarria
Affiliation:
Veterinary Institute for Tropical and High Altitude Research (IVITA), University of San Marcos, Box 4270, Lima, Peru
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Abstract

Breeding data from 1543 artificial inseminations, performed on 763 purebred and crossbred zebu cattle reared on 73 small farms, in the Amazon basin of Peru from 1980 to 1986, were evaluated. Inseminations were performed during morning hours using Holstein or Brown Swiss frozen semen. The calving to first oestrus and calving to conception intervals, number of services per conception, intervals between services and conception rate were evaluated. A total of 64-4% of first services and 61-4% of conceptions occurred between the middle of the dry season and the middle of the rainy season. Farm effect proved to be the most important source of variation for all reproductive traits. Other important factors influencing the interval from parturition to first service were breed of cow, parity and season of service. Parity influenced the interval from parturition to conception while parity, time of oestrous detection and inseminator influenced conception rate. The long post-partum anoestrous interval was found to be the most important factor limiting reproductive efficiency on small farms involved in the artificial insemination programme. The reproductive performance of the crossbred cattle tended to be better than that of the purebred zebu cattle.

Keywords

artificial inseminationreproductiontropical Americazebu
Type
Research Article
Information
Animal Production , Volume 50 , Issue 1 , February 1990 , pp. 41 - 49
Copyright
Copyright © British Society of Animal Science 1990

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