Effects of Varying Dietary Protein and Energy Levels on Growth Rate and Body Fat of Broilers

Abstract

Three experiments were conducted in which the protein and energy levels were varied in an attempt to produce broiler carcasses with more acceptable fat deposition at market age. Male broilers had more abdominal fat than female broilers to 46 days of age. Females deposited abdominal fat at a rate greater than that of the males after 46 days of age. A significant percentage of the weight gain after 46 days was in the form of abdominal fat in the female. Feeding no supplemental fat in the diet for the first seven days resulted in a decrease in the percentage of abdominal fat at 49 days of age. High dietary protein levels were detrimental to growth during the starting period (0 to 14 days) but beneficial in maximizing gain and feed efficiency during the finishing period (28 to 49 days). Feeding no supplemental fat for the first 7 days of age, regardless of the energy level of the finisher, produced the least abdominal fat of all diets fed to 49 days. More abdominal fat was produced when supplemental fat was withheld for 0 to 10 days or 0 to 14 days of age.

The Influence of Egg Weight Loss During and Immediately Following Incubation, and Dietary Intake of Energy and Protein on Growth and Feed Efficiency in Broiler Chickens

“…Similar results were reported b! Sunde (1956) and by Hargis and Creger (1980) No interaction between dietary CP and energy levels was noted, in contrast to reports by Jackson et al (1982a,b). This indicates that the reduced body weight of birds on high CP starter diets was due to the CP level of the diet and the subsequent C:P ratio.…”

Growth Performance and Carcass Characteristics of Two Different Broiler Strains by Different Levels of Metabolizable Energy

“…모든 실험 사료는 육계 사료 제조 공 장에서 펠렛-익스팬더 가공사료로 육계 전기는 크럼블, 육계 Hill and Dansky(1954), Donaldson et al(1956), Summers et al(1965), Leeson et al (1996a, b), Hargis and Creger (1980) Leeson et al(1996b)이 보고한 결과와 마찬가지로 대사에너지 수준 간에 유의한 차이가 없 었다. 하지만 (Lumeiji, 1997).…”

Effect of Early Nutrition on Abdominal Fat in Broilers

“…In the present studies no significant differences in body weight were observed even though abdominal fat contents varied significantly. Hargis and Creger (1980) and Maurice et al (1982) also observed influences of the diet during the 1st 7 days on subsequent fat deposition in broilers.…”

“…(1977) observed no significant effect on fat pad development when broiler chicks were fed ad libitum a low energy diet (2,233 kcal metabolizable energy (ME)/kg) compared to those fed a more typical energy diet. Hargis and Creger (1980) reported that feeding no supplemental fat in the diet for the first 7 days of age, regardless of the energy level of the finisher diet, produced the least abdominal fat in 49-dayold broilers. More abdominal fat was produced, however, when supplemental fat was withheld from 0 to 10 or 0 to 14 days of age.…”