Abstract
This study was conducted to determine the methionine requirement for maximal weight gain and nitrogen retention in growing kittens fed a 24% crystalline amino acid diet containing no cystine. Six male and six female kittens were fed each of six levels of methionine, 0.45, 0.7, 0.8, 0.9, 1.0 and 1.5% of the diet, for 10 days in a 6 X 6 Latin square design. Diets were made isonitrogenous with alanine and were isocaloric with a calculated metabolizable energy of approximately 5.0 kcal/g, Food intake and body weight were recorded daily, and nitrogen balance for each cat in each 10-day period was determined. On the 7th day of each period, blood was drawn for subsequent analysis of plasma methionine concentrations. From growth response results, the methionine requirement in the absence of dietary cystine was estimated to be 0.70% of the diet for male and female kittens. On the basis of nitrogen balance results, the methionine requirement appeared to be slightly higher, at 0.75% of the diet for both sexes. Plasma methionine concentrations appear to increase exponentially with dietary methionine concentrations, and were of limited usefulness in estimating the methionine requirement of the kitten in the context of the experimental protocol used here.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 962-971 |
| Number of pages | 10 |
| Journal | Journal of Nutrition |
| Volume | 112 |
| Issue number | 5 |
| DOIs | |
| State | Published - Jan 1 1982 |
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ASJC Scopus subject areas
- Medicine (miscellaneous)
- Nutrition and Dietetics
Cite this
Methionine requirement of the growing kitten, in the absence of dietary cystine. / Schaeffer, M. C.; Rogers, Quinton; Morris, James.
In: Journal of Nutrition, Vol. 112, No. 5, 01.01.1982, p. 962-971.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Methionine requirement of the growing kitten, in the absence of dietary cystine
AU - Schaeffer, M. C.
AU - Rogers, Quinton
AU - Morris, James
PY - 1982/1/1
Y1 - 1982/1/1
N2 - This study was conducted to determine the methionine requirement for maximal weight gain and nitrogen retention in growing kittens fed a 24% crystalline amino acid diet containing no cystine. Six male and six female kittens were fed each of six levels of methionine, 0.45, 0.7, 0.8, 0.9, 1.0 and 1.5% of the diet, for 10 days in a 6 X 6 Latin square design. Diets were made isonitrogenous with alanine and were isocaloric with a calculated metabolizable energy of approximately 5.0 kcal/g, Food intake and body weight were recorded daily, and nitrogen balance for each cat in each 10-day period was determined. On the 7th day of each period, blood was drawn for subsequent analysis of plasma methionine concentrations. From growth response results, the methionine requirement in the absence of dietary cystine was estimated to be 0.70% of the diet for male and female kittens. On the basis of nitrogen balance results, the methionine requirement appeared to be slightly higher, at 0.75% of the diet for both sexes. Plasma methionine concentrations appear to increase exponentially with dietary methionine concentrations, and were of limited usefulness in estimating the methionine requirement of the kitten in the context of the experimental protocol used here.
AB - This study was conducted to determine the methionine requirement for maximal weight gain and nitrogen retention in growing kittens fed a 24% crystalline amino acid diet containing no cystine. Six male and six female kittens were fed each of six levels of methionine, 0.45, 0.7, 0.8, 0.9, 1.0 and 1.5% of the diet, for 10 days in a 6 X 6 Latin square design. Diets were made isonitrogenous with alanine and were isocaloric with a calculated metabolizable energy of approximately 5.0 kcal/g, Food intake and body weight were recorded daily, and nitrogen balance for each cat in each 10-day period was determined. On the 7th day of each period, blood was drawn for subsequent analysis of plasma methionine concentrations. From growth response results, the methionine requirement in the absence of dietary cystine was estimated to be 0.70% of the diet for male and female kittens. On the basis of nitrogen balance results, the methionine requirement appeared to be slightly higher, at 0.75% of the diet for both sexes. Plasma methionine concentrations appear to increase exponentially with dietary methionine concentrations, and were of limited usefulness in estimating the methionine requirement of the kitten in the context of the experimental protocol used here.
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U2 - 10.1093/jn/112.5.962
DO - 10.1093/jn/112.5.962
M3 - Article
VL - 112
SP - 962
EP - 971
JO - Journal of Nutrition
JF - Journal of Nutrition
SN - 0022-3166
IS - 5
ER -