Effect of energy level, diethylstilbestrol and slaughter weight on carcass grain, carcass yield and composition of Philippine steers.

Date

6-1969

Abstract

A study to determine the effect of dietary energy level, hormone treatment and slaughter weight on the carcass performance of Philippine steers was conducted in the Department of Animal Husbandry, from May, 1966 to December, 1968. Twenty-one animals were used in a 2 x 2 x 3 factorial experiment in completely randomized design. Data were statistically analyzed using Complete Least Square Analysis. Constants were fitted for initial liveweight, energy level, hormone treatment and slaughter weight. Two energy levels (medium 57.6% TDN and high, 72.2% TDN), two hormone levels (0 and 24 mg implant) and three slaughter weights (160 kg. 235 kg. and 310 kg.) were the treatments. The animals were concentrate-fed individually but lot-fed with silage. The 24 mg diethylstilbestrol (DES) was implanted at the beginning of the test. The animals were slaughtered at the time they reached their pre-assinged slaughter weights.

The results showed no significant differences in carcass weight, dressing percentage, rate and efficiency of carcass gain as affected by dietary energy level. In carcass components only yield of the four major cuts as percent of liveweight was significantly (P < .05) increased by the higher energy level. No significant differences between the two energy levels were observed in the lean, fat and bone production of the steers.

Diethylstilbestrol implantation had no significant effect on carcass weight, dressing percentage, rate and efficiency of carcass gain. Stilbestrol-treated steers gave significantly (P< .05) higher yields of four major cuts as percentages of liveweight. No significant differences due to DES-implantation were obtained in other carcass components.

Generally, as slaughter weight increased significant (P < .01) increases in the amount of carcass weight, total carcass gain, total cut-up yield of carcass, yield of four major cuts, lean, fat and bone production of steers were observed. Average daily carcass gain (ADCG) was significantly higher (P< .01) in the first slaughter weight group (160 kg.) as compared with those in the second (235 kg.) and third (310 kg.) slaughter weight groups but not in any other group comparison. Efficiency of carcass gain was highest (P< .01) in the first slaughter weight group followed by the second (P< .05) and third slaughter weight group. The values were 0.065, 0.061, and 0.040 kg. carcass gain per kilogram, respectively.

As percentages of carcass and of liveweight, the following components gave significant differences between slaughter weight groups as indicated: total cut-up yield of carcass as percent of liveweight was higher (P < .05) in 160 kg. vs. 310 kg.; separable fat as percent of carcass was statistically different between all slaughter weight groups comparison (P< .01), higher (P(< .05) in 310 kg. vs. 235 kg., and higher (P < .01) in 310 kg. vs. 160 kg.; total bone as percent of carcass was statistically different between all slaughter weight groups comparison (P< .01).

Document Type

Master Thesis

Adviser/Committee Chair

Joseph C. Madamba

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 1969 A5 D33

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