69686 20191122145053.0 doi 10.1080/1828051X.2017.1415705 sideral 105208 ART-2018-105208 eng (orcid)0000-0003-2827-3054 Abecia, J.A. Universidad de Zaragoza Ewes giving birth to female lambs produce more milk than ewes giving birth to male lambs 2018 Access copy available to the general public Unrestricted A total number of 23, 271 parturitions were studied from two sheep farms of the Churra (CH) and Lacaune (LA) breeds. CH lambs were kept with their mothers during the first 30 days of age; from that moment onwards, ewes were machine-milked. LA lambs were not allowed to suckle their mothers, and ewes were machine-milked from parturition. Milking length (ML), total milk yield (TMY) and daily milk yield (DMY) (TMY/ML) were calculated. For the CH breed, there was an effect (p¿<¿.001) of prolificacy on ML, TMY and DMY and of offspring gender on TMY and DMY. For the LA breed, prolificacy and offspring gender had an effect (p¿<¿.001) on ML, TMY and DMY. Ewes giving birth to twin lambs produced more milk (CH:¿+0.15¿l/d and¿+27.5¿l/ewe; LA:¿+0.15¿l/d and¿+11¿l/ewe), than ewes giving birth to single lambs. For single parturitions in the CH breed, ewes giving birth to females produced more milk (+0.04¿l/d and¿+5.2¿l/ewe) (p¿<¿.0001) than ewes giving birth to males. In this breed, this effect of female offspring on milk production was similar for those ewes giving birth to twin lambs. In conclusion, ewes presenting twin parturitions produced more milk than single parturitions and the presence of female lambs had a positive effect on milk yield. These results open new possibilities to increase profitability of dairy sheep farms through a selection of the offspring gender. info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 1.265 2018 VETERINARY SCIENCES 51 / 141 = 0.362 2018 Q2 T2 AGRICULTURE, DAIRY & ANIMAL SCIENCE 27 / 61 = 0.443 2018 Q2 T2 0.467 2018 Animal Science and Zoology 2018 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Palacios, C. 2008 700 Universidad de Zaragoza Dpto. Produc.Animal Cienc.Ali. Área Producción Animal 17, 3 (2018), 736-739 Ital. J. Anim. Sci. Italian Journal of Animal Science 1594-4077 101650 http://zaguan.unizar.es/record/69686/files/texto_completo.pdf Versión publicada 118464 http://zaguan.unizar.es/record/69686/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:69686 articulos driver 2019-11-22-14:43:58 ARTICLE