Journal article

THE INCIDENCE OF, AND FACTORS ASSOCIATED WITH, FAILURE TO MATE BY 245 DAYS OF AGE IN THE GILT

GM CRONIN, PH HEMSWORTH, CG WINFIELD, B MULLER, WA CHAMLEY

ANIMAL REPRODUCTION SCIENCE | ELSEVIER SCIENCE BV | Published : 1983

Abstract

The incidence of, and factors associated with, gilts failing to mate between 29 and 35 weeks of age were studied over 12 months at a large intensive piggery in southern Australia. After excluding gilts culled as physically unsound, 10.5% of the remaining 2484 gilts failed to mate and were slaughtered. Seventy percent of unmated gilts had ovulated, and of these, 54% had shown negative or low responses to the back-pressure test (BPT) and 16% had shown moderate or high responses. Few prepubertal gilts (1%) had abnormal reproductive tracts. When group size was greater than 50 gilts (< 0.9 m2/gilt) immediately prior to mating (27-28 weeks of age), there was a higher incidence of unmated gilts and..

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