Abstract

Crossbred first-Iitter sows in a commercial swine unit were assigned to serve as controls after summer weanings or were fed altrenogest for 7 days or altrenogest for 7 days plus supplemental fat for 14 days after weaning. While similar proportions of sows came into heat after weaning, sows fed altrenogest returned to estrus about 9 days later than control sows. Incidence of anestrus was similar across sow groups (31%), while most of the sows not detected in heat could be classified by cause after examining serum progesterone concentrations at 3 wk after weaning. Nearly 69 % of the sows not detected in heat had luteal function, indicating a failure to detect sows when in true estrus or failure of sows to show behavioral estrus. Farrowing traits were similar among treatments, however, there was a tendency for sows fed altrenogest to have higher farrowing rates.; Swine Day, Manhattan, KS, November 15, 1984

Keywords: Swine day, 1984, Kansas Agricultural Experiment Station contribution, no. 85-132-S, Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service), 461, Swine, Altrenogest, Fat, First-litter sows

How to Cite:

Stevenson, J. S., Davis, D. L. & Pollmann, D. S., (1984) “Altrenogest and fat for summer breeding of first-litter sows”, Kansas Agricultural Experiment Station Research Reports 1(10), 12-14. doi: https://doi.org/10.4148/2378-5977.6148