caa a22 4500 388059931 CHVBK 20180307125117.0 cr unu---uuuuu 161130e199806 xx s 000 0 eng 10.1017/S1357729800009255 doi S1357729800009255 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800009255 Estimation of genetic parameters for litter size in sheep: a comparison of a repeatability and a multivariate model [Elektronische Daten] Genetic parameters were estimated for litter size in two prolific sheep breeds, i.e. the Zwartbles and the synthetic breed Swifter. Genetic parameters and breeding values for litter size in different parities were estimated using both a repeatability and a multivariate animal model. The estimated heritability from the repeatability model was 0·10 for the Zwartbles and 0·12 for the Swifter. For the multivariate model, heritability of litter size in first, second and third parity was 0·05, 0·07 and 0·10 for the Zwartbles and 0·09, 0·12 and 0·09 for the Swifter. Genetic correlation for litter size in Swifter was 0·81 between parity 1 and 2 and 0·99 between parity 2 and 3. For the Zwartbles genetic correlations were all very close to unity. Environmental correlations between litter size in subsequent parities were not constant over parities. Phenotypic variance in litter size in both breeds was 0·309 in first parity and was almost 50% higher in later parities. Based on the results it is recommended to apply a multiple trait model. Copyright © British Society of Animal Science 1998 genetic parameters nationallicence litter size nationallicence multiple trait nationallicence repeatability model nationallicence sheep nationallicence de Vries M. J. Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands van der Waaij E. H. Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands van Arendonk J. A. M. Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands Animal Science Cambridge University Press 66/3(1998-06), 685-688 1357-7298 66:3<685 1998 66 ASC https://doi.org/10.1017/S1357729800009255 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800009255 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- de Vries M. J. Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands NATIONALLICENCE 700 1- van der Waaij E. H. Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands NATIONALLICENCE 700 1- van Arendonk J. A. M. Animal Breeding and Genetics Group, Wageningen Institute of Animal Sciences, Wageningen Agricultural University, PO Box 338, 6700 AH Wageningen, The Netherlands NATIONALLICENCE 773 0- Animal Science Cambridge University Press 66/3(1998-06), 685-688 1357-7298 66:3<685 1998 66 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge