Analysis of variability in nutrient digestibilities in broiler chickens

British Poultry Science
S MaisonnierB Carré

Abstract

1. Forty commercial broiler chickens from two different breeding origins were used for individual measurements of growth performance from d 7 to d 21. From d 21 to d 24 a balance experiment was carried out for the measurement of metabolisable energy (ME), digestibilities of lipids, starch and amino acids, viscosity of excreta water-extract, and amount of water loss. After this, the weight and length of the different parts of the gastrointestinal tract were measured for each bird. During the experiment, the birds were fed with an experimental diet containing 5 g/kg of guar gum in order to increase the variability of responses. 2. There were no significant (P < 0.05) differences between the two breeds in 21 d live weight, food:gain ratio, ME value or the digestibilities of lipids, starch and total amino acids. Significant (P < 0.05) differences between the two breeds were observed for caecal size, excreta guar gum degradation measured using viscosity measurements, and vent score. 3. Pooling all the individual data, individual ME values were correlated (r2 = 0.33) with individual food:gain ratios, which shows that a great part of ME variation was associated with individual variation. 4. Several significant (P < 0.05) correlations ...Continue Reading

References

Jul 1, 1977·British Poultry Science·Y DrorZ Nitsan
Jan 1, 1980·The Journal of Nutrition·G RiesenfeldS Hurwitz
Sep 24, 1999·Reproduction, Nutrition, Development·I Crévieu-GabrielB Carré
Jan 1, 1986·Genetics, Selection, Evolution : GSE·A Hassan, P Delpech

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