Effects of Pre-Pubertal Plane of Nutrition on Skeletal Growth, Lamb Mortality, IGF-1 Concentrations, Quantity and Quality of Colostrum Production in Kurdish Female Lambs
Subject Areas : Camel
ص.
منتیان
1
(Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran)
ح.ر.
میرزایی الموتی
2
(Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran)
ف.
فتاحنیا
3
(Department of Animal Science, Faculty of Agriculture, Ilam University, Ilam, Iran)
ر.
معصومی
4
(Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran)
Keywords: colostrum, IGF-1, Kurdish ewes, lamb mortality, pre-pubertal diets, skeletal growth,
Abstract :
This experiment was conducted to investigate the effect of pre-pubertal plane of nutrition on the skeletal growth, lamb mortality, insulin-like growth factor1 (IGF-1) concentrations, quantity and quality of colostrum produced in ewe lambs. A total of 40 clinically health Kurdish female lambs (30±8.6 d and weighing 10.2±3.4 kg) were randomly allocated to one of two experimental diets in pre-weaning period: high quality diet (HQD, 2.50 Mcal ME/kg dry matter (DM) and 148 g CP/kg DM) or low quality diet (LQD, 2.02 Mcal ME/kg DM and 87 g CP/kg DM). At weaning, one half of lambs from each group was randomly separated and assigned to HQD or LQD. So there were four treatment groups in post-weaning period: H-H (HQD pre- and post-weaning); H-L (HQD pre-weaning and LQD post-weaning); L-H (LQD pre-weaning and HQD post-weaning) and L-L (LQD pre and post-weaning, control group). Weekly DM intake was determined. Serum IGF-1 concentrations was determined by ELISA method. The HQD treatment increased DM intake and BW (body Weight) compared with the LQD treatment during pre-weaning period(P<0.01). At 210 d of age, animals fed LQD during the pre-weaning period and HQD during the post-weaning period (L-H sequence) had greater body length (BL), wither height (WH), hip height (HH) and hip width (HW) than animals on the H-L sequence. No interaction of the two periods was detected for heart girth, HW, WH, BL at 210 d of age (P>0.05). HW at weaning time was not affected by quality of diet. However, lambs of H-H and L-H sequences had a higher increase in HW during post-weaning period compared with lambs of H-L and L-L sequences. Quantity and quality of colostrum was not influenced by pre-pubertal plane of nutrition (P>0.05). Based on the results of current study the authors’ suggestion is that skeletal compensatory growth during post-weaning period can compensate losses caused by poor nutrition during pre-weaning period. And also, the results indicated that skeletal size is a better indication for first-lactation colostrum yield than body weight (BW).
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