Effect of genotype, sex and rearing temperature on carcase and meat quality of guinea fowl.
1. The aim of our study was to analyse the effect of genotype (label and standard), sex and rearing temperature (simulating daily outdoor in the summer or winter) on the carcase and meat quality of guinea fowl. Using 20 animals per treatment, slaughtered at 96 d of age we measured the breast angle and the thickness of the skin on the wing membrane. Carcases were weighed and cut into parts according to a standardised procedure to determine the percentages of abdominal fat, breasts, wings and thighs with shanks. 2. At slaughter, standard guinea fowl were heavier than label guinea fowl and for both genotypes, the females were heavier than the males (+5.6%). The mean value of breast angle was 85 degrees. This value was significantly higher for the standard guinea fowls and for the females of both genotypes compared with males. Thus, female carcases, particularly standard females, were more compact. The skin was thicker for the standard guinea fowls (0.84 mm vs 0.77 mm) which could be due to more subcutaneous fat. 3. Carcase yield was higher for the males (68.7% vs 68.2%). The percentage of abdominal fat was higher for the standard guinea fowls (2.8% vs 2.4%) and for the females of both genotypes compared with males. The label guinea fowls had higher yields of breasts and thighs with shanks. For both lines, the breast and thigh meat of females was judged more tender and less stringy. 4. Low rearing temperature decreased growth performance but had no significant effect on carcase quality.
Baeza
E
E
Station de Recherches Avicoles, CR INRA de Tours, Nouzilly, France. baeza@tours.inra.fr
Juin
H
H
Rebours
G
G
Constantin
P
P
Marche
G
G
Leterrier
C
C
D000005:Abdomen; D000273:Adipose Tissue / Q000378:metabolism*; D000818:Animals; D001823:Body Composition / Q000502:physiology*; D001835:Body Weight / Q000502:physiology*; D005260:Female; D005838:Genotype; D008297:Male; D008460:Meat / Q000592:standards*; D011200:Poultry / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D012621:Seasons; D012737:Sex Factors; D013696:Temperature