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Information Journal Paper

Title

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

Pages

 Start Page 841 | End Page 847

Abstract

 This experiment was conducted to investigate the effect of pre-pubertal plane of nutrition on the SKELETAL GROWTH, LAMB MORTALITY, insulin-like growth factor 1 (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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