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Implications of growth rates and compensatory growth on puberty attainment in Nellore heifers.
Miszura, A A; Ferraz, M V C; Cardoso, R C; Polizel, D M; Oliveira, G B; Barroso, J P R; Gobato, L G M; Nogueira, G P; Biava, J S; Ferreira, E M; Pires, A V.
Afiliación
  • Miszura AA; Department of Nutrition and Animal Production, College of Veterinary and Animal Science, University of São Paulo, Duque de Caxias North Avenue, n 225, Pirassununga, São Paulo 13635-000, Brazil.
  • Ferraz MVC; Department of Animal Science, Federal University of Amazonas, Macurany Avenue, Jacareacanga, Parintins, Amazonas 69152-240, Brazil.
  • Cardoso RC; Department of Animal Science, Texas A&M University, 2471 TAMU, College Station, TX 77843-2471, USA.
  • Polizel DM; Department of Nutrition and Animal Production, College of Veterinary and Animal Science, University of São Paulo, Duque de Caxias North Avenue, n 225, Pirassununga, São Paulo 13635-000, Brazil; Department of Animal Science, College of Agriculture "Luiz de Queiroz", University of São Paulo, Pádua Dia
  • Oliveira GB; Department of Nutrition and Animal Production, College of Veterinary and Animal Science, University of São Paulo, Duque de Caxias North Avenue, n 225, Pirassununga, São Paulo 13635-000, Brazil.
  • Barroso JPR; Department of Nutrition and Animal Production, College of Veterinary and Animal Science, University of São Paulo, Duque de Caxias North Avenue, n 225, Pirassununga, São Paulo 13635-000, Brazil.
  • Gobato LGM; Department of Nutrition and Animal Production, College of Veterinary and Animal Science, University of São Paulo, Duque de Caxias North Avenue, n 225, Pirassununga, São Paulo 13635-000, Brazil.
  • Nogueira GP; College of Veterinary Medicine, São Paulo State University (UNESP), Araçatuba, São Paulo 16050-680, Brazil.
  • Biava JS; Department of Animal Science, College of Agriculture "Luiz de Queiroz", University of São Paulo, Pádua Dias Avenue, n 11, PO Box 09, Piracicaba, São Paulo 13418-900, Brazil.
  • Ferreira EM; Department of Animal Science, College of Agriculture "Luiz de Queiroz", University of São Paulo, Pádua Dias Avenue, n 11, PO Box 09, Piracicaba, São Paulo 13418-900, Brazil.
  • Pires AV; Department of Nutrition and Animal Production, College of Veterinary and Animal Science, University of São Paulo, Duque de Caxias North Avenue, n 225, Pirassununga, São Paulo 13635-000, Brazil; Department of Animal Science, College of Agriculture "Luiz de Queiroz", University of São Paulo, Pádua Dia
Domest Anim Endocrinol ; 74: 106526, 2021 01.
Article en En | MEDLINE | ID: mdl-32810656
This study investigated the effects of growth rates and compensatory growth on puberty attainment in Nellore heifers. Nellore heifers (n = 120), weaned at 8 ± 0.75 mo of age, were blocked by sire and BW (180 ± 8.6 kg) and assigned randomly to receive 1 of 4 treatments over a 10-mo period. Treatments included ad libitum feeding (high gain, HG), feed intake to gain 0.6 kg/d (medium gain, MG), restricted feeding (0.2 kg/d) for 4 mo followed by ad libitum feeding for 6 mo (compensatory gain, CG), and alternating periods of ad libitum and restricted feeding for 2 mo each throughout the trial (alternated CG, ACG). Puberty was assessed weekly by transrectal ultrasonography. Blood samples were collected at 8, 11, and 18 mo of age and at puberty to determine circulating concentrations of leptin. At 18 mo of age, nonpubertal heifers were treated with a puberty induction protocol using an intravaginal progestin device. There was no treatment effect (P = 0.17) on the percentage of heifers pubertal by 18 mo of age (HG: 66, MG: 40, CG: 58, and ACG: 52%), BW at puberty, and age at puberty. However, HG heifers had higher ADG (P < 0.01), dry matter intake (P < 0.01), and leptin concentrations (P = 0.03) than heifers from other groups. The response to the puberty induction protocol was similar (P = 0.90) among treatments. Regarding sire effects (genetic effects), there was an effect (P = 0.03) on the percentage of heifers pubertal by 18 mo of age and a tendency (P = 0.07) of sire effect in response to the puberty induction protocol. Compensatory growth appears to be an effective managerial approach to decrease feeding costs and stimulate puberty in Nellore heifers.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Maduración Sexual / Bovinos / Leptina / Restricción Calórica / Dieta Tipo de estudio: Guideline Límite: Animals Idioma: En Revista: Domest Anim Endocrinol Asunto de la revista: ENDOCRINOLOGIA / MEDICINA VETERINARIA Año: 2021 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Estados Unidos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Maduración Sexual / Bovinos / Leptina / Restricción Calórica / Dieta Tipo de estudio: Guideline Límite: Animals Idioma: En Revista: Domest Anim Endocrinol Asunto de la revista: ENDOCRINOLOGIA / MEDICINA VETERINARIA Año: 2021 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Estados Unidos