| Autor: |
Jerry L. Sell, Gonzalo G. Mateos |
| Rok vydání: |
1981 |
| Předmět: |
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| Zdroj: |
Poultry Science. 60:1925-1930 |
| ISSN: |
0032-5791 |
| DOI: |
10.3382/ps.0601925 |
| Popis: |
An experiment involving 20 birds was conducted to quantitate the extrametabolic effect of yellow grease used in semisynthetic diets for laying hens. Four diets were arranged as a 2 × 2 factorial with two levels of fat (0 and 7%) and two carbohydrate sources (sucrose and starch). The nitrogen-corrected metabolizable energy (MEn) of yellow grease was calculated from lipid digestibility data and from actual determination of dietary MEn. The MEn of yellow grease varied with the dietary carbohydrate source and with the procedure used for estimation. When yellow grease was added to a starch-containing diet, the MEn of the fat was 8497 and 9714 kcal/kg from the lipid digestibility data and actual MEn determination, respectively. In the sucrose-containing diet the MEn of yellow grease was 8210 and 10071 kcal/kg, respectively. The data suggest that supplemental fat facilitated energy utilization from nonlipid constituents of the diet. The mechanism is unknown but may be related to a decrease in rate of food passage as a consequence of fat supplementation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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