Genetic and environmental parameters for ovulation rate, twinning rate, and weight traits in a cattle population selected for twinning

Journal of Animal Science
K E GregoryL V Cundiff

Abstract

A project was implemented in 1981 with the objective of increasing twinning rate in cattle. Daughters of foundation sires had twin calves at a frequency of from 8 to 13%, and foundation females had twin calves at an average frequency of 50%. Data were analyzed on twinning rate, ovulation rate, and weight traits. The h2 of ovulation rate increased from .11 to .38 for a single estrous cycle to the mean of eight estrous cycles. From all data, h2 for single observation of ovulation rate and twinning rate were .10 and .09, respectively. The r(g) between them was .75. The h2 of weight traits ranged from .42 to .54 when weight traits were analyzed pair-wise with ovulation rate and with twinning rate. The r(g) between weight traits with ovulation rate ranged from .15 to .30 and with twinning rate ranged from .24 to .39. Phenotypic mean twinning rate increased from 1.07 to 1.29 calves per parturition for females born 1981 through 1993, and adjusted mean predicted breeding value (PBV) increased from 1.07 to 1.33 calves per parturition. Phenotypic mean ovulation rate for fall of 1984 through fall 1994 birth groups increased from 1.11 to 1.26 per estrous cycle, and adjusted mean PBV for ovulation rate increased from 1.11 to 1.29 per estrou...Continue Reading

Citations

Jul 20, 2005·Animal Genetics·O CobanogluB W Kirkpatrick
Aug 10, 2007·Journal of Animal Science·S E EchternkampK E Gregory
Jun 27, 2007·Journal of Animal Science·S E EchternkampK E Gregory
Aug 9, 2012·Mammalian Genome : Official Journal of the International Mammalian Genome Society·Aurélie VinetFlorence Phocas
Jun 6, 2015·PloS One·Brian W Kirkpatrick, Chris A Morris
Sep 28, 2001·Journal of Dairy Science·J M JohansonM R Dentine
May 12, 2010·Journal of Animal Physiology and Animal Nutrition·N G Hossein-Zadeh
Nov 30, 2016·Journal of Animal Science·A S Young, B W Kirkpatrick
Feb 22, 2017·Animal : an International Journal of Animal Bioscience·B MoioliL Buttazzoni
Feb 18, 2009·Animal Genetics·E-S KimB W Kirkpatrick
Mar 7, 2021·Animals : an Open Access Journal From MDPI·Victor E Cabrera, Paul M Fricke
Apr 4, 2021·Animals : an Open Access Journal From MDPI·Shaileen P McGovernFernando A Di Croce

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