scholarly journals Chronic heat stress and feed restriction affects carcass composition and the expression of genes involved in the control of fat deposition in broilers – Corrigendum

2017 ◽  
Vol 156 (1) ◽  
pp. 82-82
Author(s):  
J. De Antonio ◽  
M. F. Fernandez-Alarcon ◽  
R. Lunedo ◽  
G. H. Squassoni ◽  
A. L. J. Ferraz ◽  
...  
Keyword(s):  
Heat Stress ◽  
Fat Deposition ◽  
Carcass Composition ◽  
Feed Restriction ◽  
Expression Of Genes

scholarly journals Chronic heat stress and feed restriction affects carcass composition and the expression of genes involved in the control of fat deposition in broilers

2017 ◽  
Vol 155 (9) ◽  
pp. 1487-1496 ◽  
Author(s):  
J. DE ANTONIO ◽  
M. F. FERNANDEZ-ALARCON ◽  
R. LUNEDO ◽  
G. H. SQUASSONI ◽  
A. L. J. FERRAZ ◽  
...  
Keyword(s):  
Heat Stress ◽  
Growth Hormone Receptor ◽  
Molecular Mechanisms ◽  
Regulatory Element ◽  
Fat Content ◽  
Fat Deposition ◽  
Carcass Composition ◽  
Limiting Factors ◽  
Feed Restriction ◽  
Ad Libitum

SUMMARYHeat stress (HS) is among the major limiting factors to growth of broilers. Heat stress also results in changes in the characteristics of the carcass, such as an increase in fat deposition. The molecular mechanisms responsible for fat deposition in broilers as a response to HS remain unknown. The current study aimed to describe the molecular mechanisms associated with the effects of high temperature and feed restriction due to chronic heat exposure at 32 °C, and to describe the resulting changes in the growth performance and carcass characteristics of the broilers at 21 and 42 days of age. In the current study, 441 male Cobb-500®broilers were subjected to three treatments that differed in rearing temperature and feeding regime: chronic HS fedad libitum(HS/AL), thermoneutral environment fedad libitum(TN/AL) and TN and pair-feeding on the feed intake (FI) of the heat-exposed group (TN/PF). HS increased fat content in the breast and wings and decreased fat content in the legs, but did not influence abdominal fat. These effects occurred regardless of reducing consumption induced by HS. Furthermore, HS, independently of reduced FI, increased liver sterol-regulatory element-binding protein-1 (SREBP-1) mRNA in both ages and growth hormone receptor (GHR) mRNA at 42days, whereas feed restriction reducedGHRmRNA only at 21days. In conclusion, increased fat content in the breast and wings was accompanied by a higher gene expression ofGHRandSREBP-1, suggesting the involvement of both genes in the control of fat deposition in broilers exposed to HS.

scholarly journals Effect of dietary supplementation of some antioxidants on growth performance, carcass composition and breast meat characteristics in quails reared under heat stress

2010 ◽  
Vol 55 (No. 5) ◽  
pp. 209-220 ◽  
Author(s):  
H. Imik ◽  
M. Aydemir Atasever ◽  
M. Koc ◽  
M. Atasever ◽  
K. Ozturan
Keyword(s):  
Heat Stress ◽  
Vitamin E ◽  
Vitamin C ◽  
Growth Performance ◽  
Carcass Composition ◽  
Pectoralis Muscle ◽  
Breast Meat ◽  
B Values ◽  
Japanese Quails ◽  
L Value

This research investigates the effects of adding vitamin E, vitamin C, vitamin E+C, and alpha lipoic acid to feed rations for Japanese quails (Coturnix coturnix japonica) exposed to heat stress. The aspects studied were growth performance, carcass composition and breast meat characteristics. Five groups of quails, containing 50 birds each (250 Japanese quails: 150 female and 100 male) were used. The 21-days-old birds were fed for a period of 21 days, and they were kept in a controlled environment with a temperature of 34˚C between 08:00 and 17:00 and a temperature of 24˚C for the remaining part of the day. The five groups under study included: a control group without any additive (BS), a group fed diets with vitamin E (BSE), with vitamin C (BSC), with vitamin E+C (BSEC) and with lipoic acid (BSLA). The supplement additions to the diets did not affect the growth performance and carcass composition of the birds. The TBA (malonaldehyde) value of the BS group was significantly higher (P < 0.001) than in the other groups. L*, a*, and b* values in muscle samples, superficialis pectoralis muscle (SPM) and deep pectoralis muscle (DPM), were determined. In the samples from the SPM, the L* value of the BS group was higher than in the BSC group; the a* value of the BSE group was higher than in the BS group; and the b* value of the BSC group was higher than in the BS group (P < 0.05). In the samples from the DPM, the L* value of the BS group was higher than in the BSEC group (P < 0.05); the a* values of the BSE and BSEC groups were higher than in the BS group (P < 0.05); and the b* values of the BSC, BSEC and BSLA groups were higher than in the BS group (P < 0.01). In the microbiological analysis of meat, total aerobic mesophilic bacterial counts of the BS and BSE groups were higher than the counts in the BSC, BSEC, and BSLA groups (P < 0.01); coliform bacterial counts were higher in the BSE group than in the BSC group (P < 0.05); and lactic acid was higher in the BSE and BSEC groups than in the BSC and BSLA groups (P < 0.01). In conclusion, the supplemented antioxidants did not exhibit any significant effect on growth performance, but they significantly decreased lipid oxidation in the meat.  

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.

Expression of genes that encode cellular oxidant/antioxidant systems are affected by heat stress

2018 ◽  
Vol 45 (3) ◽  
pp. 389-394 ◽  
Author(s):  
Walid S. Habashy ◽  
Marie C. Milfort ◽  
Romdhane Rekaya ◽  
Samuel E. Aggrey
Keyword(s):  
Heat Stress ◽  
Antioxidant Systems ◽  
Expression Of Genes
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