000079149 001__ 79149
000079149 005__ 20200117221603.0
000079149 0247_ $$2doi$$a10.1016/j.domaniend.2018.05.001
000079149 0248_ $$2sideral$$a107036
000079149 037__ $$aART-2018-107036
000079149 041__ $$aeng
000079149 100__ $$aRodríguez-Sánchez, J.A.
000079149 245__ $$aInfluence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation
000079149 260__ $$c2018
000079149 5060_ $$aAccess copy available to the general public$$fUnrestricted
000079149 5203_ $$aThe aim of this study was to examine the effects of 2 postweaning feeding management approaches (FEED: 0.8 [HIGH] vs 0.6 [MOD] kg/d target ADG) on the performance of heifers of 2 beef breeds (BREED: Parda de Montaña [PA] vs Pirenaica) calving at 2 yr. Twenty-five heifers previously creep fed before weaning (6 mo) were assigned to 2 planes of nutrition from 6 to 15 mo of age. At 15 mo, they were inseminated, and then received similar diets until weaning of their first calf (4 mo postcalving). Several parameters were measured to analyze growth and development (BW; ADG; size measures at 6 mo, 15 mo, calving, and weaning), performance at puberty and first breeding, and dam and calf performance in the first lactation (calving traits, ADG, milk yield). Metabolic (glucose, cholesterol, NEFA, ß-hydroxybutyrate, and urea) and endocrine status (IGF-I and leptin) were assessed in plasma samples collected every 3 mo from 6 mo to calving and monthly during lactation. No interaction between BREED and FEED was observed. Heifers from the HIGH feeding treatment had higher postweaning ADG than those on the LOW diet. At 15 mo, they had greater BW, heart girth, and external pelvic area, but they did not differ thereafter. All heifers reached puberty at similar BW (55% mature BW) but different ages. Heifers from the HIGH treatment tended (P < 0.09) to be pubertal earlier, and PA heifers were 1.6 mo younger than Pirenaica heifers (P < 0.05) at puberty. At the time of conception (452 ± 59 kg) and calving (471 ± 51 kg), BW was above common recommendations in all groups. Calving traits and performance in lactation did not differ between feeding treatments. BREED only influenced birth weight; PA calves being heavier (P < 0.05), which resulted in a larger calf/cow BW ratio, but no effect on calving difficulty or subsequent performance. Metabolic substrates and hormones depended mostly on sampling date, which was related to current energy and protein intake. Glucose (P < 0.001), cholesterol (P < 0.001), and IGF-I (P < 0.05) were greater during the postweaning phase in heifers on the HIGH diet, and persistent physiological effects were observed during lactation. Age at puberty was negatively related with IGF-I (r = -0.43, P < 0.001), but not with leptin concentrations. In conclusion, regardless of breed, a moderate growth rate ensured adequate heifer development and performance until the first lactation, whereas no advantage was gained from enhanced postweaning gains.
000079149 536__ $$9info:eu-repo/grantAgreement/ES/DGA-EDRF/A11$$9info:eu-repo/grantAgreement/ES/MINECO-INIA/RTA2010-057$$9info:eu-repo/grantAgreement/ES/MINECO-INIA/RTA2013–059$$9info:eu-repo/grantAgreement/ES/MINECO-INIA/RZP2015–001
000079149 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000079149 590__ $$a2.302$$b2018
000079149 591__ $$aAGRICULTURE, DAIRY & ANIMAL SCIENCE$$b6 / 61 = 0.098$$c2018$$dQ1$$eT1
000079149 591__ $$aENDOCRINOLOGY & METABOLISM$$b103 / 145 = 0.71$$c2018$$dQ3$$eT3
000079149 592__ $$a0.79$$b2018
000079149 593__ $$aAnimal Science and Zoology$$c2018$$dQ1
000079149 593__ $$aFood Animals$$c2018$$dQ1
000079149 593__ $$aEndocrinology$$c2018$$dQ1
000079149 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000079149 700__ $$aSanz, A.
000079149 700__ $$aFerrer, J.
000079149 700__ $$0(orcid)0000-0003-3943-5311$$aCasasús, I.
000079149 773__ $$g65 (2018), 24-37$$pDomest. anim. endocrinol.$$tDOMESTIC ANIMAL ENDOCRINOLOGY$$x0739-7240
000079149 8564_ $$s300934$$uhttps://zaguan.unizar.es/record/79149/files/texto_completo.pdf$$yPostprint
000079149 8564_ $$s8735$$uhttps://zaguan.unizar.es/record/79149/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000079149 909CO $$ooai:zaguan.unizar.es:79149$$particulos$$pdriver
000079149 951__ $$a2020-01-17-21:44:28
000079149 980__ $$aARTICLE