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Effect of pre-partum dam supplementation, creep-feeding and post-weaning feedlot on age at puberty in Nellore heifers
- Source :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- The objective of this study was to evaluate the impact of three nutritional strategies and their interactions on age at puberty in Nellore heifers. The treatments were arranged in factorial design (2×2×2), including three periods of supplementation: Period I – Pre-partum dam supplementation with protein (n=122; 0.5 kg soybean meal/cow, daily) during the last trimester of gestation or no supplementation (n=115); Period II – Creep-feeding (n=120; 22% CP and 72% TDN) to heifer calves for 95 d before weaning or no creep-feeding (n=117); and Period III – Post-weaning feedlot from 7 to 11 month of age (n=117; 17% CP and 58% TDN) or no feedlot (n=120; only pasture). There was no interaction among periods of supplementation. At weaning, pre-partum dam supplementation ( P =0.91) and creep-feeding ( P =0.89) did not affect BW of heifer calves. At the end of the post-weaning feedlot (Period III) BW was greater ( P P =0.88) or creep-feeding ( P =0.57). However, the post-weaning feedlot treatment anticipated ( P =0.06) the age at puberty. At 18 month of age, the percentage of pubertal heifers was increased by post-weaning feedlot (31.7 vs. 13.3%; P
- Subjects :
- 0301 basic medicine
Meal
Pregnancy
animal structures
General Veterinary
animal diseases
Soybean meal
0402 animal and dairy science
04 agricultural and veterinary sciences
Biology
medicine.disease
040201 dairy & animal science
Creep feeding
03 medical and health sciences
030104 developmental biology
Animal science
CONFINAMENTO ANIMAL
Feedlot
medicine
Gestation
Weaning
Animal Science and Zoology
Pre partum
Subjects
Details
- ISSN :
- 18711413
- Volume :
- 195
- Database :
- OpenAIRE
- Journal :
- Livestock Science
- Accession number :
- edsair.doi.dedup.....475564ed9374a58e372ea425e69c116e