Influence of age and sex on the blood biochemical constituent values of broiler breeders during the egg-laying stage

Effect of Broiler Breeders Ageing on Hematological Parameters, Biochemical Analyses, and Maternal Immunity Transfer Rates

“…Schmidt et al (2008) observed that, compared to adult males and young birds, mature females' plasma total protein values were higher, contrasting with our results. These current results are in agreement with Rezende et al (2021) who found that serum albumin values obtained by females were higher than those obtained by males and reported that the high levels of protein required by females for egg development and the lower proportions of protein and amino acids in male diets also contributed to the lower values discovered for male serum albumin. The present findings are also in agreement with the results of Dunbar et al (2005), who reported that total protein concentrations may be reduced as a result of lower albumin or globulin levels, which in turn may affect the amount of proteins deposited per egg.…”

“…Aspartate aminotransferase activity is currently thought to be a very sensitive but nonspecific indication of hepatic illness in other avian species (Harr, 2002). The results closely match those obtained by Rezende et al (2021), who stated that AST activity levels in birds from a 60-week-old flock were significantly greater, and there was also an upward trend consistent with our results. One interpretation of this would be that hepatic and muscular damage increase with ageing, elevating AST values.…”

“…The present findings are also in agreement with the results of Dunbar et al (2005), who reported that total protein concentrations may be reduced as a result of lower albumin or globulin levels, which in turn may affect the amount of proteins deposited per egg. The results also closely match those obtained by Rezende et al (2021), who observed a trend of higher globulin values with ageing (up to 52 weeks of age).…”

“…The results coincide with those of Rezende et al (2021), who conducted a study on Cobb broiler breeders and revealed that at 60 weeks, males had higher uric acid levels than females. Furthermore, the uric acid levels in these birds increased with age, and the values seen in birds that were 52 and 60 weeks old were greater than those seen in birds that were 28 and 36 weeks old.…”

“…Similar results were obtained by Chapman et al (1977), who found that the range of serum triglycerides (240-672 mg/dL) was much larger than the range of cholesterol (58-125 mg/dL) in laying Rhode Island Red chickens (8-11 months old). Additionally, Rezende et al (2021) reported that Cobb broiler breeder females had considerably greater serum triglyceride and cholesterol levels than males at various ages (28, 36, 44, 52, and 60). One interpretation of this would be the dramatically increased oestrogen secretion at the onset of egg production in laying hens, which increases serum levels of triglycerides and phospholipids (Chaikoff et al, 1956;Dashiti et al, 1983).…”