{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T22:48:47Z","timestamp":1791154127108,"version":"4.1.0"},"reference-count":25,"publisher":"Cambridge University Press (CUP)","issue":"3","license":[{"start":{"date-parts":[[2012,4,26]],"date-time":"2012-04-26T00:00:00Z","timestamp":1335398400000},"content-version":"unspecified","delay-in-days":12414,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Br J Nutr"],"published-print":{"date-parts":[[1978,5]]},"abstract":"<jats:p>1. New Zealand White (NZW) rabbits were given, between 4 and 8 weeks of age, a range of diets, based on oats and fish meal, containing from 104 to 255 g crude protein (nitrogen \u00d7 6.25; CP)\/kg to establish the level of CP below which growth was retarded.<\/jats:p><jats:p>2. In three experiments each diet was fed to four animals and food intake, growth and N balance were measured over 4 weeks. Body analysis was also carried out after two of the experiments.<\/jats:p><jats:p>3. The rates of food intake and growth of animals increased with dietary CP concentration until a CP concentration of approximately 150 g\/kg diet had been reached. Beyond this there was little further improvement. N balance studies showed that once this dietary concentration of CP had been reached, there was a reduced rate of N retention.<\/jats:p><jats:p>4. Good agreement was found between N retention measured by balance methods and by body analysis: body composition showed a tendency towards an increase in fat and a decrease in N as the dietary protein concentration was reduced.<\/jats:p><jats:p>5. Microbial protein produced in the caecum and eaten during coprophagy, was found to supplement the dietary protein by approximately 2 g CP\/d, or by only 0.1 of a normal dietary intake of CP.<\/jats:p><jats:p>6. In the second part of the study NZW rabbits were offered, between 5 and 8 weeks of age, diets based on oats containing 150 g CP\/kg. The protein supplied by oats was supplemented with maize gluten, gelatin, groundnut meal, casein, soya-bean meal or fish meal.<\/jats:p><jats:p>7. Rabbits offered diets containing casein, soya-bean meal and fish meal gained 40\u201350 g\/d similar, to animals given a well-balanced control diet, while those given diets containing maize gluten, gelatin or groundnut meal gained approximately 30 g\/d. This indicated that amino acid balance in dietary protein was important to the growing rabbit.<\/jats:p><jats:p>8. In later experiments, diets based on cereals and groundnut meal supplemented with varying amounts of lysine and methionine were offered during a 3-week post-weaning period in order to assess requirements for those limiting amino acids.<\/jats:p><jats:p>9. The addition of both lysine and methionine improved growth rates. The minimum requirements for normal growth were found to be 6.2 g methionine+cystine and 9.4 g lysine\/kg diet.<\/jats:p>","DOI":"10.1079\/bjn19780075","type":"journal-article","created":{"date-parts":[[2005,5,19]],"date-time":"2005-05-19T23:49:52Z","timestamp":1116546592000},"page":"601-613","source":"Crossref","is-referenced-by-count":40,"title":["A study of the protein and amino acid requirements of the growing New Zealand White rabbit with emphasis on lysine and the sulphur-containing amino acids"],"prefix":"10.1017","volume":"39","author":[{"given":"D.","family":"Spreadbury","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2012,4,26]]},"reference":[{"key":"S000711457800241X_ref022","first-page":"203","volume":"8","author":"Proto","year":"1969","journal-title":"Produz. Anim."},{"key":"S000711457800241X_ref023","first-page":"62","volume":"9","author":"Short","year":"1959","journal-title":"J. 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