A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months

Detalhes bibliográficos
Autor(a) principal: Ferraz, M. V.C.
Data de Publicação: 2018
Outros Autores: Pires, A. V., Santos, M. H., Silva, R. G., Oliveira, G. B., Polizel, D. M., Biehl, M. V., Sartori, R., Nogueira, G. P. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1017/S1751731117002464
http://hdl.handle.net/11449/186857
Resumo: Nelore heifers usually begin their reproductive life at ≥24 months of age mainly due to suboptimal nutritional conditions and genetics. This study aimed to determine the effect of expected progeny difference (EPD) for age at first calving and average daily gain (ADG) on puberty in Nelore (Bos taurus indicus) heifers. A total of 58 weaned heifers (initial BW=174±6 kg; age=9±1 months) were allocated into 28 feedlot pens. Heifers were born from four sires, of which two had low EPD for age at first calving (L; n=33) and two had high EPD for age at first calving (H; n=25). Then, heifers of each EPD were randomly assigned to high ADG (HG; 0.7 kg) or low ADG (LG; 0.3 kg), resulting in four treatments: heifers from L sires were submitted to either HG (LHG; n=17) or LG (LLG; n=16), and heifers from H sires were submitted to either HG (HHG; n=12), or LG (HLG; n=13). The HG heifers were fed a 75% grain diet, whereas the LG heifers received 93% of forage in their diet. Blood samples were collected at 9, 14, 18, 24 and 28 months of age for IGF1 and leptin determination. There was a treatment effect (P<0.01) on the proportion of heifers that attained puberty by 18 (62%, 0%, 0% and 0%), 24 (100%, 6%, 54% and 0%) or 36 (100%, 100%, 100% and 38%) months of age for LHG, LLG, HHG and HLG treatments, respectively. In addition, mean age at puberty was different across treatments (P<0.01). Heifers from the LHG achieved puberty at the earliest age when compared with cohorts from other treatments (18.1, 28.9, 23.9 and 34.5 months for LHG, LLG, HHG and HLG, respectively). Serum IGF1 concentrations were higher for L heifers compared with H cohorts at 9, 14, 18, 24 and 28 months of age (P<0.01; treatment×age interaction), whereas circulating leptin concentrations were higher (P<0.01; age effect) as heifers became older, regardless of the treatments. In conclusion, only Nelore heifers with favorable genetic merit for age at first calving were able to attain puberty by 18 months of age. In heifers with unfavorable genetic merit for age at first calving, supplementary feeding to achieve high ADG was unable to shift the age at puberty below 24 months.
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spelling A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 monthsage at first calvingBos taurus indicusIGF1leptinnutritionNelore heifers usually begin their reproductive life at ≥24 months of age mainly due to suboptimal nutritional conditions and genetics. This study aimed to determine the effect of expected progeny difference (EPD) for age at first calving and average daily gain (ADG) on puberty in Nelore (Bos taurus indicus) heifers. A total of 58 weaned heifers (initial BW=174±6 kg; age=9±1 months) were allocated into 28 feedlot pens. Heifers were born from four sires, of which two had low EPD for age at first calving (L; n=33) and two had high EPD for age at first calving (H; n=25). Then, heifers of each EPD were randomly assigned to high ADG (HG; 0.7 kg) or low ADG (LG; 0.3 kg), resulting in four treatments: heifers from L sires were submitted to either HG (LHG; n=17) or LG (LLG; n=16), and heifers from H sires were submitted to either HG (HHG; n=12), or LG (HLG; n=13). The HG heifers were fed a 75% grain diet, whereas the LG heifers received 93% of forage in their diet. Blood samples were collected at 9, 14, 18, 24 and 28 months of age for IGF1 and leptin determination. There was a treatment effect (P<0.01) on the proportion of heifers that attained puberty by 18 (62%, 0%, 0% and 0%), 24 (100%, 6%, 54% and 0%) or 36 (100%, 100%, 100% and 38%) months of age for LHG, LLG, HHG and HLG treatments, respectively. In addition, mean age at puberty was different across treatments (P<0.01). Heifers from the LHG achieved puberty at the earliest age when compared with cohorts from other treatments (18.1, 28.9, 23.9 and 34.5 months for LHG, LLG, HHG and HLG, respectively). Serum IGF1 concentrations were higher for L heifers compared with H cohorts at 9, 14, 18, 24 and 28 months of age (P<0.01; treatment×age interaction), whereas circulating leptin concentrations were higher (P<0.01; age effect) as heifers became older, regardless of the treatments. In conclusion, only Nelore heifers with favorable genetic merit for age at first calving were able to attain puberty by 18 months of age. In heifers with unfavorable genetic merit for age at first calving, supplementary feeding to achieve high ADG was unable to shift the age at puberty below 24 months.Department of Nutrition and Animal Production College of Veterinary and Animal Science University of São PauloDepartment of Animal Science College of Agriculture Luiz de Queiroz (ESALQ) University of São PauloSchool of Veterinary Medicine São Paulo State University (UNESP)School of Veterinary Medicine São Paulo State University (UNESP)Universidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Ferraz, M. V.C.Pires, A. V.Santos, M. H.Silva, R. G.Oliveira, G. B.Polizel, D. M.Biehl, M. V.Sartori, R.Nogueira, G. P. [UNESP]2019-10-06T15:17:50Z2019-10-06T15:17:50Z2018-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article569-574http://dx.doi.org/10.1017/S1751731117002464Animal, v. 12, n. 3, p. 569-574, 2018.1751-732X1751-7311http://hdl.handle.net/11449/18685710.1017/S17517311170024642-s2.0-85032210240Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengAnimalinfo:eu-repo/semantics/openAccess2021-10-22T18:26:56Zoai:repositorio.unesp.br:11449/186857Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:05:41.948275Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
title A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
spellingShingle A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
Ferraz, M. V.C.
age at first calving
Bos taurus indicus
IGF1
leptin
nutrition
title_short A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
title_full A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
title_fullStr A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
title_full_unstemmed A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
title_sort A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
author Ferraz, M. V.C.
author_facet Ferraz, M. V.C.
Pires, A. V.
Santos, M. H.
Silva, R. G.
Oliveira, G. B.
Polizel, D. M.
Biehl, M. V.
Sartori, R.
Nogueira, G. P. [UNESP]
author_role author
author2 Pires, A. V.
Santos, M. H.
Silva, R. G.
Oliveira, G. B.
Polizel, D. M.
Biehl, M. V.
Sartori, R.
Nogueira, G. P. [UNESP]
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Ferraz, M. V.C.
Pires, A. V.
Santos, M. H.
Silva, R. G.
Oliveira, G. B.
Polizel, D. M.
Biehl, M. V.
Sartori, R.
Nogueira, G. P. [UNESP]
dc.subject.por.fl_str_mv age at first calving
Bos taurus indicus
IGF1
leptin
nutrition
topic age at first calving
Bos taurus indicus
IGF1
leptin
nutrition
description Nelore heifers usually begin their reproductive life at ≥24 months of age mainly due to suboptimal nutritional conditions and genetics. This study aimed to determine the effect of expected progeny difference (EPD) for age at first calving and average daily gain (ADG) on puberty in Nelore (Bos taurus indicus) heifers. A total of 58 weaned heifers (initial BW=174±6 kg; age=9±1 months) were allocated into 28 feedlot pens. Heifers were born from four sires, of which two had low EPD for age at first calving (L; n=33) and two had high EPD for age at first calving (H; n=25). Then, heifers of each EPD were randomly assigned to high ADG (HG; 0.7 kg) or low ADG (LG; 0.3 kg), resulting in four treatments: heifers from L sires were submitted to either HG (LHG; n=17) or LG (LLG; n=16), and heifers from H sires were submitted to either HG (HHG; n=12), or LG (HLG; n=13). The HG heifers were fed a 75% grain diet, whereas the LG heifers received 93% of forage in their diet. Blood samples were collected at 9, 14, 18, 24 and 28 months of age for IGF1 and leptin determination. There was a treatment effect (P<0.01) on the proportion of heifers that attained puberty by 18 (62%, 0%, 0% and 0%), 24 (100%, 6%, 54% and 0%) or 36 (100%, 100%, 100% and 38%) months of age for LHG, LLG, HHG and HLG treatments, respectively. In addition, mean age at puberty was different across treatments (P<0.01). Heifers from the LHG achieved puberty at the earliest age when compared with cohorts from other treatments (18.1, 28.9, 23.9 and 34.5 months for LHG, LLG, HHG and HLG, respectively). Serum IGF1 concentrations were higher for L heifers compared with H cohorts at 9, 14, 18, 24 and 28 months of age (P<0.01; treatment×age interaction), whereas circulating leptin concentrations were higher (P<0.01; age effect) as heifers became older, regardless of the treatments. In conclusion, only Nelore heifers with favorable genetic merit for age at first calving were able to attain puberty by 18 months of age. In heifers with unfavorable genetic merit for age at first calving, supplementary feeding to achieve high ADG was unable to shift the age at puberty below 24 months.
publishDate 2018
dc.date.none.fl_str_mv 2018-03-01
2019-10-06T15:17:50Z
2019-10-06T15:17:50Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1017/S1751731117002464
Animal, v. 12, n. 3, p. 569-574, 2018.
1751-732X
1751-7311
http://hdl.handle.net/11449/186857
10.1017/S1751731117002464
2-s2.0-85032210240
url http://dx.doi.org/10.1017/S1751731117002464
http://hdl.handle.net/11449/186857
identifier_str_mv Animal, v. 12, n. 3, p. 569-574, 2018.
1751-732X
1751-7311
10.1017/S1751731117002464
2-s2.0-85032210240
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Animal
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 569-574
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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