Effects of nutrition level during lactation and rearing periods on growth patterns, puberty onset and fertility rate in beef heifers

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dc.bibliographicCitation.conferencedate25 - 27 June 2014es_ES
dc.bibliographicCitation.conferencename2014 Western Section Meetingen
dc.bibliographicCitation.conferenceplaceSan Angelo, Texases_ES
dc.bibliographicCitation.endpage195es_ES
dc.bibliographicCitation.stpage191es_ES
dc.bibliographicCitation.titleProceedings Volume 65. Western Section American Society of Animal Scienceen
dc.contributor.authorRodríguez Sánchez, José Antonioes_ES
dc.contributor.authorSanz Pascua, Albinaes_ES
dc.contributor.authorCasasús Pueyo, Isabeles_ES
dc.date.accessioned2014-08-18T08:44:13Z
dc.date.available2014-08-18T08:44:13Z
dc.date.issued2014es_ES
dc.description.abstractThis study analysed the effects of different nutrition levels from heifer birth to first Timed Artificial Insemination (TAI) at 15 months, on their growth patterns, puberty onset and fertility rate. Twenty-nine Parda de Montaña heifers, born in autumn, were assigned to two growth rates in the lactation period (0-6 months: 700 vs. 1000 g/d, to Low (L) and High (H), respectively) and in the rearing period (6-15 months: 700 vs. 1000 g/d, to Low (L) and High (H), respectively), resulting in 4 treatments: LL, LH, HL, HH. At 15 months of age an Ovsynch protocol with an intravaginal progesterone device was used to synchronize and breed the heifers. Weight was taken weekly from birth until breeding season was finished to study the evolution of weight and average daily gain (ADG) along the experiment. Heifers were bled weekly throughout the rearing period to determinate the onset at puberty through plasma progesterone concentration. Heifers’ average daily gains were influenced by the lactation and the rearing nutrition levels, animals compensating the growth rates in the different phases. The age at onset of puberty was higher in the animals receiving the Lactation low nutrition level (P<0.01) and the Rearing low nutrition level (P<0.001). Heifers of all lots showed similar weights at onset of puberty (55% adult weight), conception age (16.4 months) and fertility rate (89%). It can be concluded that the advance of the first service from 21 to 15 months of age is possible in extensive systems of beef cattle, if growth rates of 1 kg/d during lactation or/and rearing are guaranteed. Additional research is needed to determinate the impacts on adult size and frequency of dystocia at first and subsequent calvings of early-bred heifersen
dc.description.statusPublishedes_ES
dc.identifier.citationProceedings Volume 65. Western Section American Society of Animal Science: San Angelo, Texas, 25 - 27 June 2014, p. 191-195en
dc.identifier.urihttp://hdl.handle.net/10532/2613
dc.language.isoenes_ES
dc.publisherAmerican Society of Animal Sciencees_ES
dc.relation.ispartofseriesProceedings. Western Section American Society of Animal Scienceen
dc.relation.ispartofseriesnr65es_ES
dc.relation.urihttps://www.asas.org/docs/default-source/western-section/western-section-2014-proceedings-book-now-available.pdf?sfvrsn=0es_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/es/*
dc.subject.agrovocProductividades
dc.subject.agrovocGanado bovinoes
dc.subject.agrovocEtapas del desarrollo animales
dc.subject.otherproducción y sanidad animales_ES
dc.titleEffects of nutrition level during lactation and rearing periods on growth patterns, puberty onset and fertility rate in beef heifersen
dc.typeProceedings Paper*
dc.typearticle
dc.type.refereedNon-Refereedes_ES
dc.type.specifiedArticlees_ES

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