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Effect of body weight change on conception in beef heifers


, : Effect of body weight change on conception in beef heifers. Korean Journal of Animal Science 28(2): 62-65

To study the effect of body weight on conception, 9 years of records on 306 yearling heifers were used. Data were collected from the Kansas state University Polled Hereford herd at Manhattan, Kansas from March 1972 to August 1980. Yearling heifers were divided by conception status and data from pregnant heifers were divided by the conception date (May 20 through June 9, June 10 through June 30 and July 1 through July 21). Body weight were measured each month from January through June and November and body condition scores were taken by weight-height ratio in May and November. The average body weight and age of heifers at first conception were 289.2 .+-. 36.6 Kg and 449.6 .+-. 21.5 days, respectively and the correlation coefficient between them was r = 0.449. Heifers that conceived weighed more in November and January than heifers that did not conceive, although body weight from February to June, body weight changes from November to May and body condition scores in May and November were not different. The average April weight affected conception date, thus heifers that conceived early were heavier. Body condition and body weight change shortly before the start of breeding season were more important than those of the previous fall for their conception.

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