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A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
- Source :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP, Scopus, Repositório Institucional da UNESP, Universidade Estadual Paulista (UNESP), instacron:UNESP, Animal, Vol 12, Iss 3, Pp 569-574 (2018)
- Publication Year :
- 2018
-
Abstract
- Made available in DSpace on 2019-10-06T15:17:50Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-03-01 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
- Subjects :
- 0301 basic medicine
Leptin
Age effect
animal structures
animal diseases
Ice calving
Nutritional Status
Weaning
Biology
Bos taurus indicus
SF1-1100
leptin
03 medical and health sciences
age at first calving
Animal science
Expected progeny difference
Animals
Treatment effect
Sexual Maturation
Insulin-Like Growth Factor I
Genetics
Reproduction
IGF1
0402 animal and dairy science
Reproductive life
Mean age
04 agricultural and veterinary sciences
040201 dairy & animal science
Animal Feed
Animal culture
Diet
030104 developmental biology
nutrition
Feedlot
Animal Science and Zoology
Cattle
Female
PUBERDADE PRECOCE
Genetic merit
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP, Scopus, Repositório Institucional da UNESP, Universidade Estadual Paulista (UNESP), instacron:UNESP, Animal, Vol 12, Iss 3, Pp 569-574 (2018)
- Accession number :
- edsair.doi.dedup.....490d5a4fe7ec50fcf7b8d1884564031f