Trails to improve growth and carcass quality in duck

الملخص EN

Reducing fat in duck lean is considering the first step towards improving carcass quality.

A total of 144 male and female, one day old white Peking ducks were divided into 6 equal groups, each group subdivided into 2 subgroup.

One of them contain 12 males while the other contain 12 females.

Six dietary treatments were applied for both males and females have the same group number.

Basal diet supplemented with salbutamol 2mg for 56 days (whole experiment period) (Treatment 1), or from 29-56 days of age) (Treatment 2), basal diet supplemented with Chromium Piclonate 2mg) (Treatment 3), modified calorie protein ratio diet by increasing protein concentration 0.5 % (0-2 weeks) and 2 % (3-8 weeks) (Treatment 4), basal diet but after reduce the recommended level to 95 % of control diet for starter period and to 90 % of control diet for grower and finisher periods) (Treatment 5), while basal diet without supplementation, modification, or restriction was as control (Treatment 6).

The results concerning growth performance demonstrated that salbutamol or chromium supplementation and decreased calorie protein ratio improved all parameters of growth performance.

While restricted diet reduced final body weight and final body weight gain but feed conversion ratio was improved.

Carcass traits showed that dressing percentage and breast muscle was increased.

Skin and sub-cuteness Fat percentage was decreased.

Meanwhile, abdominal fat was reduced significantly with all dietary treatments as compared with control.

Also, chemical analysis of meat demonstrated that muscular fat was decreased significantly in all treatments compared with control ; however, moisture content was increased.

Serum analysis showed that total cholesterol was decreased with all dietary treatments while serum protein increased insignificantly in all female groups but was significantly increased in all male groups as compared with control.

It could be concluded that salbutamol and chromium supplementation or decreased calorie protein ratio improved all growth performance, but restricted diet reduced final body weight while feed conversion ratio improved.

Dressing percentage and carcass characteristics were improved with all dietary treatments.

And cholesterol and cholesterol L.D.L.

reduced with all experimental treatments in both sexes compared with control.