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Comparison of growth performance and nutrient retention of weaner pigs given diets based on casein, free amino acids or conventional proteins

Published online by Cambridge University Press:  09 March 2007

D.I Officer ,
E. S Batterham  and
D. J Farrell
D.I Officer
Affiliation:
NSW Agriculture, Wollongbar Agricultural Institute, Wollongbar, NSW 2477, Australia
E. S Batterham
Affiliation:
NSW Agriculture, Wollongbar Agricultural Institute, Wollongbar, NSW 2477, Australia
D. J Farrell
Affiliation:
The University of New England, Department of Biochemistry, Microbiology and Nutrition, Armidale, NSW 2351, Australia
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Abstract

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In two experiments the potential value of diets based on casein or free amino acids (FAA) for amino acid utilization experiments were examined. In Expt 1 the optimum dietary electrolyte balance (dEB) for a casein-based diet was estimated by supplemention with 10 or 20 g NaHCO3/kg, to produce diets containing 64, 183 or 302 mmol/kg. In addition, piglet growth performance and efficiency of nutrient deposition of piglets given the casein diets were compared with two multiple protein source diets; Supercreep, a commercial multiple protein source diet or CFS (casein-fish-soyabean-sugar) or a FAA-based diet. Expt 2 was designed to compare piglet response to FAA diet stored at - 15° with twice daily feeding, with FAA diet stored at ambient temperature (13–30°) and offered ad libitum. A CFS diet was used as a positive control and the experiment was conducted over the 10–20 kg growth phase. Expt 1 used forty-eight piglets weaned at 20–22 d of age and allocated to one of six treatments formulated to contain at least 0·84 g lysine/MJ digestible energy in a randomized block design. Piglets given the CFS and Supercreep diets produced superior growth rates (518, 491 g/d) to those given a FAA diet (353 g/d) or casein diet containing 0, 10 or 20 g NaHCO3/kg respectively (365,417,390 g/d) between 5 and 20 kg live weight. Piglets given the casein and FAA diets had higher amino acid digestibilities than those given the Supercreep and CFS diets.The increase in the dEB of the casein diet from 64 to 183 mmol/kg improved piglet growth performance between 5 and 20 kg by 14%. All piglets given casein diets had similar ileal and faecal digestibilities, empty-body compositions, nutrient deposition rates and retention ratios. The results of Expt 2 showed that there was no beneficial effect on piglet performance of storing the FAA diet at -15° and feeding twice daily. Based on the results of these two experiments, neither the casein (0, 10, 20 g NaHCO3/kg) nor FAA diets were suitable for estimating amino acid utilization by the piglet. There remain unidentified factors which limit the growth performance of piglets given the casein and FAA diets.

Keywords

CaseinAmino acidsPigs
Type
Animal Nutrition
Information
British Journal of Nutrition , Volume 77 , Issue 5 , May 1997 , pp. 731 - 744
Copyright
Copyright © The Nutrition Society 1997

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