Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Life Sciences
Reciprocal Recurrent Selection For 21-Day Litter Weight Of Crossbred Gilts. Ii. Reproductive Performance Of Purebred Females Producing Purebred And Two-Way Cross Litters And Performance Of Purebred And Crossbred Pigs, L. D. Young, I. T. Omtvedt, J. A. Whatley Jr., R. K. Johnson
Reciprocal Recurrent Selection For 21-Day Litter Weight Of Crossbred Gilts. Ii. Reproductive Performance Of Purebred Females Producing Purebred And Two-Way Cross Litters And Performance Of Purebred And Crossbred Pigs, L. D. Young, I. T. Omtvedt, J. A. Whatley Jr., R. K. Johnson
Department of Animal Science: Faculty Publications
This paper reports estimates of correlated genetic change in reproductive performance of purebred gilts producing two-way cross litters and purebred sows producing purebred litters as well as postweaning performance of two-way cross and purebred pigs produced during reciprocal recurrent selection (RRS) between Line 8 (Duroc) and Line 9 (Beltsville No. 1) for 21-d litter weight production of crossbred gilts. A randomly mated control line developed from a crossbred foundation was maintained to monitor environmental change. Data were adjusted for age of dam, inbreeding of dam, inbreeding of litter (or pig) and linear and quadratic effects of day born within season. …
Reciprocal Recurrent Selection For 21-Day Litter Weight Of Crossbred Gilts. I. Selection Applied And Genetic Change In Reproduction Of Crossbred Gilts, L. D. Young, I. T. Omtvedt, J. A. Whatley Jr., R. K. Johnson
Reciprocal Recurrent Selection For 21-Day Litter Weight Of Crossbred Gilts. I. Selection Applied And Genetic Change In Reproduction Of Crossbred Gilts, L. D. Young, I. T. Omtvedt, J. A. Whatley Jr., R. K. Johnson
Department of Animal Science: Faculty Publications
Six cycles of reciprocal recurrent selection (RRS) between Line 8 (Duroc) and Line 9 (Beltsville No. 1) were completed at the Fort Reno Livestock Research Center, E1 Reno, Oklahoma. A randomly mated control line was maintained. Each cycle of selection required three seasons. Selection of purebred pigs (born in the second season) was based on the mean 21-d litter weight of their maternal and paternal half-sib crossbred gilts that were born in the first season and farrowed in the third season (XB21DLWT). On the average, 5.8 maternal and paternal half-sib gilts contributed to the mean XB21DLWT for each purebred individual. …