Protein content in the diet for fattening lambs. 1. Liveweight gain, efficiency of feed utilization and digestibility of nitrogen and amino acids in the smali intestine

T Żebrowska,H Żebrowska,J Pająk

doi:10.22358/jafs/69888/1992

Abstract

1. Effects of blood meal, fish meal, soybean meal or casein on growth and body composition in lambs M. Urbaniak Small Ruminant Research CrossRef

Highlights

The protein level in diets for fattening lambs recommended by different authors varies widely, from 14 to 24%, depening on the type of the animals, fattening intensity and source of dietary nitrogen
Gain was similar to that reported by other authors with Polish Merino lambs (Chomyszyn et al, 1973; Jayaprakash, 1984; Borys et al, 1987; Urbaniak, 1986; Kowalczyk at al., 1986; Żebrowska et al, 1987) and by Australian workers (Wynn and Thwaites, 1981; Soeparno and Davis, 1982)
The poor daily gain of lambs on diet L indicated that 11 % crude protein in dry matter (DM) of the diet did not meet the reąuirement of growing lambs as reported earlier by Urbaniak (1986)

Summary

Introduction

The protein level in diets for fattening lambs recommended by different authors varies widely, from 14 to 24%, depening on the type of the animals, fattening intensity and source of dietary nitrogen. Polish feeding standards (1985) recommend the feeding of fattening lambs on diets with 16 to 17% crude protein in the dry matter. Results of our earlier experiments (Jayaprakash, 1984) and those of other authors (Urbaniak, 1986) indicate the possibility of reducing the protein content in diets for fattening lambs. The aim of the present work was to compare the liveweight gain, efficiency of feed utilization, amounts of protein and amino acids in duodenal digesta and. PAJĄK their digestibility in the smali intestine in lambs fed on diets with the recommended or reduced protein level

Objectives

Results

Conclusion