Seventy-two pekin ducklings aged 56 days were divided into two (36 males and 36 females). Birds from each sex were divided into two experimental diets {Force feeding and ad-libtum (commercial diet)} for 21 days. Birds from each experimental diet were divided into three groups according to their body weight (heavy, medium and light ). This work aimed to study the effect of sex, short time of force feeding and body weight on some productive and metabolic responses of Pekin ducks . Results obtained showed that :
Males were higher in their body weight and improved feed efficiency than females .Force- feeding significantly increased body weight and weight gain . Heavy weight ducks were superior in their body Weight and weight gain.
Females significantly had the higher absolute and relative weights of abdominal fat (33.5 gm and 3.35% v32.1 gm and 3.21% respectively).Force-feeding increased absolute and proportional weights of liver, carcass traits abdominal fat. Birds of heavy group were superior in absolute weights of liver , carcass traits and abdominal fat.
Females had higher serum total protein, albumin and globulin than males .force-feeding increased serum total protein3.56 gm/dl), globulin (2.09 gm/dl)and serum cholesterol (281.0 mg/ dl)than feeding ad- lib (3.40,1.89 gm/ dl and 261.7 mg/dl, respectively).However, ad-lib. Feeding significantly increased A/G ratio. Heavy body weight ducklings had significantly the highest averages of serum total protein, albumin, globulin and cholesterol.
Tissues creatinine significantiy increased in males (0.781 mg/g) than females (0.735 mg/g) , while , serum creatinine was significantly higher in females (0.499 mg/dl) than males (0.314 mg / dil) . force – feeding recorded significantly the higher averages of serum and tissues creatinine . Birds of heavy groub had significantly the highest averages of serum uric acid and tissues creatinine . However ,serum creatinine record significantiy its highest value in medium body weight birds. Females had significantly higher serum GOT and alkaline phosphatase than males . force – feeding increased significantly serum GOT and GPT transaminases .serum GOT and GPT transaminases increased in medium body weight ducklings .on the other hand, heavy body weighd ducklings recorded the highest average of serum alkaline phosphetase.
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