Gut morphology and nutrient retention responses of broiler chicks and White Pekin ducklings to dietary threonine deciency
| Autor: | T. J. Applegate, Olayiwola Adeola, N. L. Horn, J. S. Radcliffe |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Canadian Journal of Animal Science. 90:513-520 |
| ISSN: | 1918-1825 0008-3984 |
| DOI: | 10.4141/cjas10024 |
| Popis: | Growth performance, villi length and width, nutrient digestibility, basal short-circuit current, and glutamine transport were investigated in male broilers and White Pekin ducklings offered diets containing 3.3, 5.8, or 8.2 g of threonine (Thr) kg-1 in four studies. Seventy-two birds of each species were fed a standard broiler starter diet from 1 to 14 d of age followed by assignment to three dietary treatments in a randomized complete block design for a 7-d feeding trial in exp. 1 (broilers) and exp. 2 (ducklings). The dietary treatments consisted of an isonitrogenous, corn-soybean-meal-based diet with the addition of crystalline amino acids and graded levels of Thr. Dietary formulation and experimental design for exp. 3 (broilers) and exp. 4 (ducklings) were similar to exps. 1 and 2 except that birds were fed 3.3 or 8.2 g Thr kg-1 for a duration of 14 d. Chromic oxide was added to the dietary treatments as an indigestible marker. Excreta were collected on day 19 to 21 of age for exps. 1 and 2, and from day 26 to 28 of age for exps. 3 and 4. For chicks, there was no effect of dietary treatment on gain for birds fed treatments for 7 d, whereas gain increased (P |
| Databáze: | OpenAIRE |
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