title: Body composition and energy and protein nutritional requirements for weight gain in Santa Ines crossbred sheep.
abstract: This study was conducted to evaluate the body composition and net energy and protein requirements for weight gain in Santa Ines crossbred sheep. Thirty woolless, 4-month-old, castrated male sheep with an initial body weight (BW) of 19.77 ± 1.99 kg were used. Six animals (reference group) were slaughtered after the adaptation period to estimate empty body weight (EBW) and initial body composition. The remaining 24 animals were randomly distributed among four treatments (experimental diets) and slaughtered when they reached 30.24 ± 0.78 kg BW. The body composition ranged from 162.88 to 160.4 g protein/kg EBW, from 59.49 to 164.23 g fat/kg EBW and from 1.54 to 2.46 Mcal energy/kg EBW for animals ranging between 20 and 30 kg BW. The net energy requirement for Santa Ines crossbred sheep linearly increased when BW increased from 20 to 30 kg. Within that same weight range, the net protein requirement for weight gain in sheep was constant, ranging from 12.61 to 12.42 g/day to 100 g daily weight gain.
authors.affiliation: Federal Institute of Tocantins-IFTO, Pedro Afonso, TO, Brazil. darleycutrim@hotmail.com.|Department of Animal Science, Federal Rural University of Amazon, Parauapebas, Pará, 68515-000, Brazil. darleycutrim@hotmail.com.
authors.forename: Darley Oliveira
authors.initials: DO
authors.lastname: Cutrim
authors.affiliation: Department of Animal Science, Federal Rural University of Amazon, Parauapebas, Pará, 68515-000, Brazil. kaliandra.alves@ufra.edu.br.
authors.forename: Kaliandra Souza
authors.initials: KS
authors.lastname: Alves
authors.affiliation: PPGSPAA, UFRA, Belém, PA, Brazil.
authors.forename: Rozilda da Conceição
authors.initials: Rda C
authors.lastname: dos Santos
authors.affiliation: PPGSPAA, UFRA, Belém, PA, Brazil.
authors.forename: Vanessa Jaqueline Veloso
authors.initials: VJ
authors.lastname: da Mata
authors.affiliation: Department of Animal Science, Federal Rural University of Amazon, Parauapebas, Pará, 68515-000, Brazil.
authors.forename: Luis Rennan Sampaio
authors.initials: LR
authors.lastname: Oliveira
authors.affiliation: Department of Animal Science, Federal Rural University of Amazon, Parauapebas, Pará, 68515-000, Brazil.
authors.forename: Daiany Íris
authors.initials: DÍ
authors.lastname: Gomes
authors.affiliation: Department of Animal Science, Federal Rural University of Amazon, Parauapebas, Pará, 68515-000, Brazil.
authors.forename: Rafael
authors.initials: R
authors.lastname: Mezzomo
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000822:Animal Husbandry; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001823:Body Composition; D001835:Body Weight; D001938:Brazil; D004032:Diet / Q000662:veterinary*; D004044:Dietary Proteins / Q000378:metabolism; D004734:Energy Metabolism; D006824:Hybridization, Genetic; D008297:Male; D009751:Nutritional Requirements; D012756:Sheep / Q000502:physiology*; D015430:Weight Gain
chemical_list: D004044:Dietary Proteins
keywords: Fat; Growth; Net requirement; Weight gain composition