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Influence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation.
Domest Anim Endocrinol 2018; 65:24-37DA

Abstract

The 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, β-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.

Authors+Show Affiliations

Centro de Investigación y Tecnología Agroalimentaria (CITA) de Aragón, Instituto Agroalimentario de Aragón (IA2, CITA-Universidad de Zaragoza), Avenida, Montañana, 930, 50059 Zaragoza, Spain. Electronic address: jarss79@gmail.com.Centro de Investigación y Tecnología Agroalimentaria (CITA) de Aragón, Instituto Agroalimentario de Aragón (IA2, CITA-Universidad de Zaragoza), Avenida, Montañana, 930, 50059 Zaragoza, Spain.Centro de Investigación y Tecnología Agroalimentaria (CITA) de Aragón, Instituto Agroalimentario de Aragón (IA2, CITA-Universidad de Zaragoza), Avenida, Montañana, 930, 50059 Zaragoza, Spain.Centro de Investigación y Tecnología Agroalimentaria (CITA) de Aragón, Instituto Agroalimentario de Aragón (IA2, CITA-Universidad de Zaragoza), Avenida, Montañana, 930, 50059 Zaragoza, Spain.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

29870919

Citation

Rodríguez-Sánchez, J A., et al. "Influence of Postweaning Feeding Management of Beef Heifers On Performance and Physiological Profiles Through Rearing and First Lactation." Domestic Animal Endocrinology, vol. 65, 2018, pp. 24-37.
Rodríguez-Sánchez JA, Sanz A, Ferrer J, et al. Influence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation. Domest Anim Endocrinol. 2018;65:24-37.
Rodríguez-Sánchez, J. A., Sanz, A., Ferrer, J., & Casasús, I. (2018). Influence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation. Domestic Animal Endocrinology, 65, pp. 24-37. doi:10.1016/j.domaniend.2018.05.001.
Rodríguez-Sánchez JA, et al. Influence of Postweaning Feeding Management of Beef Heifers On Performance and Physiological Profiles Through Rearing and First Lactation. Domest Anim Endocrinol. 2018;65:24-37. PubMed PMID: 29870919.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of postweaning feeding management of beef heifers on performance and physiological profiles through rearing and first lactation. AU - Rodríguez-Sánchez,J A, AU - Sanz,A, AU - Ferrer,J, AU - Casasús,I, Y1 - 2018/05/09/ PY - 2017/08/05/received PY - 2018/04/07/revised PY - 2018/05/02/accepted PY - 2018/6/6/pubmed PY - 2018/12/28/medline PY - 2018/6/6/entrez KW - Beef breeds KW - Lactation performance KW - Metabolic and hormone profiles KW - Pre-breeding feeding strategy KW - Replacement heifer growth SP - 24 EP - 37 JF - Domestic animal endocrinology JO - Domest. Anim. Endocrinol. VL - 65 N2 - The 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, β-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. SN - 1879-0054 UR - https://www.unboundmedicine.com/medline/citation/29870919/Influence_of_postweaning_feeding_management_of_beef_heifers_on_performance_and_physiological_profiles_through_rearing_and_first_lactation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0739-7240(18)30027-4 DB - PRIME DP - Unbound Medicine ER -