title: Production traits in F1 and F2 crosses with naturalized hair breed Santa Inês ewes.
abstract: The once bred ewe slaughter method proposes the use of female lamb to produce a lamb and then both are slaughtered, increasing income and high quality meat production. Thus, this study evaluated the growth and reproduction performance of ewe lamb from Santa Inês (SI), a naturalized genetic resource, and their crosses (Dorper x Santa Inês (DOR), Texel x Santa Inês (TEX), Ile de France x Santa Inês (ILE)), as well as the survivability and development of their offspring. The animals were weighed monthly from birth to 12-months age. Samples of milk were collected on approximately 30 days of lactation. The physical-chemical analysis of milk was performed. SI females (2.94 kg) had significantly lower birth weight than DOR (3.80 kg) and TEX (3.87 kg). ILE females had higher weaning weight and weight at 12 months than SI females, which reflected in higher daily weight gain (ADG) (108.46 g/day) than TEX and SI. The pregnancy rates at 12 months were ILE (57.14%), TEX (25%), DOR (50%), and SI (28.57%), with TEX and SI differing of ILE and DOR (p = 0.03). Therefore, in semi-confinement and in a once-bred ewe production system using crossbreeding and allying meat production and reproduction, we recommend the use of Dorper and Ile de France breeds for crossbreeding with Santa Inês females. These results demonstrated the useful of a local genetic resource in productive system aiming a low cost meat production.
authors.affiliation: Faculdade de Agronomia e Veterinária, Universidade de Brasília, Brasília, Distrito Federal 70910-900 Brazil.
authors.forename: Alessandra Ferreira
authors.initials: AF
authors.lastname: da Silva
authors.affiliation: Faculdade de Agronomia e Veterinária, Universidade de Brasília, Brasília, Distrito Federal 70910-900 Brazil ; INCT-Pecuária, Brasília, Distrito Federal 70910-900 Brazil ; Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves 7712, Porto Alegre Rio Grande do Sul, 91540-000 Brazil.
authors.forename: Concepta
authors.initials: C
authors.lastname: McManus
authors.affiliation: INCT-Pecuária, Brasília, Distrito Federal 70910-900 Brazil ; Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, SP CP 96, Piracicaba, CEP 13.400-970 Brazil.
authors.forename: Tiago
authors.initials: T
authors.lastname: do Prado Paim
authors.affiliation: Faculdade de Agronomia e Veterinária, Universidade de Brasília, Brasília, Distrito Federal 70910-900 Brazil.
authors.forename: Bruno Stéfano Lima
authors.initials: BS
authors.lastname: Dallago
authors.affiliation: Faculdade de Agronomia e Veterinária, Universidade de Brasília, Brasília, Distrito Federal 70910-900 Brazil.
authors.forename: Geisa Isilda Ferreira
authors.initials: GI
authors.lastname: Esteves
authors.affiliation: Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, SP CP 96, Piracicaba, CEP 13.400-970 Brazil.
authors.forename: Helder
authors.initials: H
authors.lastname: Louvandini
authors.affiliation: INCT-Pecuária, Brasília, Distrito Federal 70910-900 Brazil.
authors.forename: José Braccini
authors.initials: JB
authors.lastname: Neto
authors.affiliation: Departamento de Ciências Fisiológicas, Instituto de Biologia-UnB, Universidade de Brasília, Campus Brasília, Brasília, DF CEP: 709010-90 Brazil.
authors.forename: Carolina Madeira
authors.initials: CM
authors.lastname: Lucci
keywords: Females; Fertility; Genetic resource; Milk; Performance; Sheep production