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Old 09-04-2018, 07:10 AM
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rss IGF - A combination of nutrition and genetics is able to reduce age at puberty in Nel

Related Articles A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months.

Animal. 2018 Mar;12(3):569-574

Authors: Ferraz MVC, Pires AV, Santos MH, Silva RG, Oliveira GB, Polizel DM, Biehl MV, Sartori R, Nogueira GP


Abstract
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
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