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Effect of protein : energy ratio in milk replacers on growth performance of goat kids
Author(s) -
YEOM KH.,
TRIERUM G. VAN,
HACHE A.,
LEE K.W.,
BEYNEN A. C.
Publication year - 2002
Publication title -
journal of animal physiology and animal nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 56
eISSN - 1439-0396
pISSN - 0931-2439
DOI - 10.1046/j.1439-0396.2002.00357.x
Subject(s) - composition (language) , chemistry , weight gain , dry matter , feed conversion ratio , food science , adipose tissue , protein efficiency ratio , zoology , body weight , biology , endocrinology , biochemistry , philosophy , linguistics
Two separate experiments were carried out to establish the effects of the protein : energy ratio in milk replacers on growth performance, plasma lipid concentrations and fatty acid composition in adipose tissue of male goat kids. In the first experiment there were 211 3‐day‐ old goat kids and in the second experiment there were 121 kids aged 3–7 days. The animals were fed ad libitum for a period of 4 weeks on milk replacers containing either 11.5 or 9.5 g crude protein/MJ metabolizable energy. In essence, protein was exchanged with fat on a weight basis. Milk concentrations were increased from 160 to 190 g/l in experiment 1, from 150 to 180 g/l in experiment 2. There were significant increases in body weight and feed intake when the milk replacer with high protein : energy ratio was fed. Group mean average daily weight gain was 168 and 203 g for the groups with low and high dietary protein : energy ratio in experiment 1; for experiment 2 the values were 139 and 160 g. Average dry matter intake was 18 and 14% higher for the diet with high protein : energy ratio in experiments 1 and 2, respectively. There was no change in either feed conversion (feed : gain ratio) or energy conversion (weight gain : energy intake ratio). There were no consistent diet effects on plasma lipid concentrations. Dietary fatty acid composition was reflected by that of adipose tissue. The milk replacer with high protein : energy ratio produced a small increase in the contents of myristic and palmitic acid in adipose tissue.