scholarly journals DIFFERENCES IN CARCASS PROPORTIONS AND COMPOSITION IN CONTROL AND HORMONE-TREATED HOLSTEIN-FRIESIAN STEERS AND BULLS

1978 ◽  
Vol 58 (3) ◽  
pp. 333-338 ◽  
Author(s):  
R. J. FORREST
Keyword(s):  
Body Weight ◽  
Hormone Treatment ◽  
Fat Deposition ◽  
Carcass Composition ◽  
Holstein Friesian

The carcass proportions and fat deposition were studied in 72 Holstein–Friesian males reared on an all-concentrate ration and slaughtered at 475 kg. One half were castrated at 136 kg body weight and 18 bulls and 18 steers were implanted with 200 mg progesterone plus 20 mg estradiol-17-β-benzoate at 340 kg. There was no evidence of any difference between steers and bulls nor of any effect of the hormone treatment for the tail, butt, tip, round or front shank portions of the carcass. Steers had proportionately more flank, short loin, brisket and back and less chuck than bulls. With hormone treatment the percentage of rib and belly decreased and the hind, rump and rear shank increased in steers. With bulls, implanting decreased the rear shank and hind and increased the belly section. In carcass composition the bulls had a higher percentage of bone than steers. Implanting decreased the fat and increased the lean percentage in steers but did not significantly affect the bulls.

EFFECTS OF CASTRATION, SIRE AND HORMONE TREATMENTS ON THE QUALITY OF RIB ROASTS FROM HOLSTEIN-FRIESIAN MALES

1975 ◽  
Vol 55 (3) ◽  
pp. 287-290 ◽  
Author(s):  
R. J. FORREST
Keyword(s):  
Hormone Treatment ◽  
Fat Deposition ◽  
Taste Panel ◽  
Quality Factors ◽  
Treatment Groups ◽  
Holstein Friesian ◽  
Panel Evaluation

A total of 72 Holstein-Friesian males from 11 sire groups were reared from birth on a concentrate ration. At 136 kg, one-half of the calves were castrated (Burdizzo) and at 340 kg, one-half of the bulls and steers were implanted with hormones (200 mg progesterone plus 20 mg estradiol-17-β-benzoate). Following slaughter at 475 kg, the 9th–11th rib sections were removed from the left sides of the carcass and frozen. Later, the four treatment and 11 sire groups were compared by taste panel evaluation of these rib roasts. No significant differences in quality factors (tenderness, juiciness, and flavor) due to pre-slaughter hormone treatment were evident in rib roasts from either bulls or steers. Hormone treatment significantly decreased (P < 0.05) fat deposition in steers and tended to increase fat levels in bulls. Rib roasts from bulls were significantly less desirable than roasts from steers in both treatment groups, for all quality factors. Significant sire effects for all taste panel evaluations were also noted.

CHANGES IN CARCASS PROPORTIONS AND FAT DEPOSITION IN CONTROL AND HORMONE-TREATED HOLSTEIN-FRIESIAN STEERS

1976 ◽  
Vol 56 (4) ◽  
pp. 721-725 ◽  
Author(s):  
R. J. FORREST
Keyword(s):  
Live Weight ◽  
Growth Period ◽  
Hormone Treatment ◽  
Fat Deposition ◽  
Carcass Weight ◽  
Lean Meat ◽  
Holstein Friesian ◽  
Estradiol 17Β

In a study of 72 Holstein-Friesian steers, one-half of which had been treated with hormones (200 mg of progesterone plus 20 mg of estradiol-17β-benzoate), variation in carcass weight was poorly correlated with lean meat deposition in various sections of the carcass, even though fat deposition during the growth period from 340 to 703 kg live weight significantly altered carcass proportions. Increasing carcass size from 172 to 393 kg did not significantly change the proportion of chuck but significantly (P < 0.05) decreased the tail, rump, tip, round, butt and shanks and increased the short loin, rib, brisket and flank. These changes can be attributed to different rates of fattening in various sections of the carcass while lean disposition is relatively constant. Hormone treatment improved carcass lean yield by depressing fat deposition.

CARCASS COMPOSITION OF MICE AFTER LONG-TERM SELECTION FOR LARGE SIX-WEEK BODY WEIGHT OR LONG SIX-WEEK TAIL LENGTH

1985 ◽  
Vol 65 (1) ◽  
pp. 239-242 ◽  
Author(s):  
R. I. McKAY ◽  
A. D. GRAHAM ◽  
R. J. PARKER
Keyword(s):  
Body Weight ◽  
Key Words ◽  
Tail Length ◽  
Fat Deposition ◽  
Carcass Composition ◽  
Control Line ◽  
Selected Lines ◽  
Term Selection ◽  
Selection For

Carcass analysis of mice selected for large 6-wk body weight (BW6) or long 6-wk tail length (TL6) is reported. There was no evidence of excessive fat deposition in the selected lines when compared to a randomly bred control line. Key words: Mice, carcass composition, selection, fat

CARCASS COMPOSITION OF YORKSHIRE BARROWS AND GILTS SLAUGHTERED BETWEEN 85 and 112 KG BODY WEIGHT

1982 ◽  
Vol 62 (1) ◽  
pp. 69-76 ◽  
Author(s):  
ANDRÉ FORTIN
Keyword(s):  
Body Weight ◽  
Carcass Composition ◽  
Chemical Compositions ◽  
Ether Extract ◽  
Protein Percentage ◽  
Slaughter Weight ◽  
Yorkshire Pigs ◽  
Intermuscular Fat ◽  
The Right ◽  
Physical And Chemical

Thirty-two Yorkshire pigs, 16 barrows and 16 gilts, were slaughtered at four weights (85, 92, 103 and 112 kg) to determine the effect of body weight at slaughter on the physical and chemical composition of the carcass. The right side was dissected into meat (including intra- and intermuscular fat), separable fat and bone which were subsequently analyzed for moisture, protein (N × 6.25), ether extract and ash. Sex did not influence (P < 0.05) carcass composition at any of the four slaughter weights. Increasing slaughter weight did not markedly alter the meat percentage of the carcass side but decreased the percentage of bone (P < 0.01). A trend toward an increasing percentage of separable fat was confirmed by the use of the allometric function Y = aXb. The effect of slaughter weight was more pronounced on the chemical than on the physical composition of the carcass side especially with respect to protein percentage. The chemical compositions of the meat, separable fat and bone were also determined. The protein percentage of each of the three physically separable components of the carcass side decreased (P < 0.01) with increasing slaughter weight. The partitioning of the chemically determined components among meat, separable fat and bone was not influenced by sex or by slaughter weight. Key words: Carcass composition, swine, sex, slaughter weight

Predicting carcass energy content and composition in broilers using the group method of data handling-type neural networks

2010 ◽  
Vol 149 (2) ◽  
pp. 249-254 ◽  
Author(s):  
A. FARIDI ◽  
M. MOTTAGHITALAB ◽  
H. DARMANI-KUHI ◽  
J. FRANCE ◽  
H. AHMADI
Keyword(s):  
Neural Networks ◽  
Body Weight ◽  
Goodness Of Fit ◽  
Carcass Composition ◽  
Poultry Meat ◽  
Alternative Methods ◽  
Group Method ◽  
Meat Production ◽  
Data Handling ◽  
Input Variables

SUMMARYThe success of poultry meat production has been strongly related to improvements in growth and carcass yield, mainly by increasing breast proportion and reducing carcass fat. Conventional laboratory techniques for determining carcass composition are expensive, cumbersome and time consuming. These disadvantages have prompted a search for alternative methods. In this respect, the potential benefits from modelling growth are considerable. Neural networks (NNs) are a relatively new option for modelling growth in animal production systems. One self-organizing sub-model of artificial NN is the group method of data handling-type NN (GMDH-type NN). The present study aimed at applying the GMDH-type NNs to data from two studies with broilers in order to predict carcass energy (CEn, MJ/g) content and relative growth (g/g of body weight) of carcass components (carcass protein, breast muscle, leg and thigh muscles, carcass fat, abdominal fat, skin fat and visceral fat). The effective input variables involved in the prediction of CEn and carcass fat content using data from the first study were dietary metabolizable energy (ME, kJ/kg), crude protein (CP, g/kg of diet), fat (g/kg of diet) and crude fibre (CF, g/kg of diet). For data from the second study, the effective input variables involved in the prediction of carcass components were dietary ME (MJ/kg), CP (g/kg of diet), methionine (g/kg of diet), lysine (g/kg of diet) and body weight (kg). Quantitative examination of the goodness of fit, using R2 and error measurement indices, for the predictive models proposed by the GMDH-type NN revealed close agreement between observed and predicted values of CEn and carcass components.

scholarly journals Influence of Holstein-Friesian Strain and Feed System on Body Weight and Body Condition Score Lactation Profiles

2007 ◽  
Vol 90 (4) ◽  
pp. 1859-1869 ◽  
Author(s):  
S. McCarthy ◽  
D.P. Berry ◽  
P. Dillon ◽  
M. Rath ◽  
B. Horan
Keyword(s):  
Body Weight ◽  
Body Condition ◽  
Body Condition Score ◽  
Feed System ◽  
Holstein Friesian ◽  
Condition Score

scholarly journals EFFECTS OF SLAUGHTER’ AGE ON GROWTH PERFORMANCE, CARCASS AND NON-CARCASS COMPONENTS TRAITS OF BERBER BREED LAMBS

2021 ◽  
Vol 52 (6) ◽  
pp. 1401-1407
Author(s):  
S. Atroun ◽  
C. Aissaoui ◽  
S. Smeti ◽  
N. Atti
Keyword(s):  
Body Weight ◽  
Growth Performance ◽  
Average Daily Gain ◽  
Carcass Composition ◽  
Carcass Yield ◽  
Body Weights ◽  
Slaughter Age ◽  
Daily Gain

The objective of this work was to study the lamb’s growth, the carcass yield and composition and the importance of main organs of Berber lambs slaughtered at 4 or 6 months. The study concerned 40 lambs reared under motherhood. Lambs of the first group were slaughtered at the age of 4 months (4M) and the second at 6 months (6M). Slaughter body weights (BW), hot and cold carcass weights and organs were recorded. The carcass was cut out and dissected. The average BW at birth was 4.14 + 0.506 kg while the BW at slaughter was 22.86 kg + 3.40 and 31.51 + 3.50 kg for 4M and 6M groups, respectively. The average daily gain were 172 and 164g for 4M and 6M groups, respectively. Therefore, during 2months the lambs of 6M group gained 8.67 kg in BW. The carcasses were heavier for 6M than 4M. The carcass commercial yields were 42% and 45% for 4M and 6M groups, respectively, resulting in 4.1 kg gain of meat during 2 months. The tissular (muscle, fat and bone) and the regional (leg, shoulder …) carcass composition did not differ among groups. All organs were heavier for 6M than 4M; however, their proportion in the empty body weight were variables. The BWand carcass gain at six months are encouraging to prolong the lamb’s slaughter age without carcass composition difference given the similar fat proportion in the carcass of both groups.

SOME PHYSIOLOGICAL AND NUTRITIONAL ASPECTS OF THE DWARF CHICKEN

1971 ◽  
Vol 51 (1) ◽  
pp. 209-216 ◽  
Author(s):  
G. RAJARATNAM ◽  
J. D. SUMMERS ◽  
A. S. WOOD ◽  
E. T. MORAN Jr.
Keyword(s):  
Body Weight ◽  
Oxygen Consumption ◽  
Weight Gain ◽  
Body Temperature ◽  
Metabolic Rate ◽  
Body Weight Gain ◽  
Carcass Composition ◽  
Lower Body ◽  
Brand Name ◽  
Dwarf Chicken

A study was undertaken to investigate the feasibility of hypothyroidism as an explanation for the smaller body size and lower metabolic activity of the recessive sex-linked dwarf chicken. A significant increase in body weight gain and feed intake for dwarf chicks with little change in these parameters for normal chicks receiving a diet supplemented with Protamone (brand name for iodinated casein) suggests a hypothyroidic state for the dwarfs. Similarly, a significantly lower body temperature, oxygen consumption and basal metabolic rate with a higher percentage of carcass fat in dwarf chicks as compared with normal ones supports the above hypothesis. Protamone supplementation of the diet increased body temperature and metabolic rate, and altered the carcass composition of the dwarfs to values closer to that of normal chicks, again suggesting a low thyroxine output for the dwarfs.

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