The effect of addition high rape cake and phytase on nutritive value of diets for broiler chickens

Acta Veterinaria

卷:63

关键词: broiler chickens;    crude phosphorus;    performance;    phytase;    rape cake;   

DOI  :  10.2298/AVB1303311B

来源: DOAJ

【 摘 要 】

The aim of this study was to evaluate the effect of high rape cake contentand phytase added to phosphorus and calcium deficient diets on the nutritivevalue for broiler chickens. Two experiments were performed: a growthexperiment on four groups of one-day-old broilers Ross 308, 30 birds pergroup (6 replications x 5 birds) and a digestibility experiment on 60chickens divided into four groups of 20 birds (4 replications of 5 birds).The digestibility of the starter diets were evaluated on chickens at 7 daysof age and of grower diets at 28 days of age. The diets used in thedigestibility tests were the same for the growth trial. In the growthexperiment four diets were prepared for the due periods: starters (1-21 day)and growers (22-49 day of chicken life). The control diet (SBM) did notcontain rape cake, while experimental diets contained 15% (starters) and 20%(growers) rape cake of Lirajet cultivar. The experimental diet denoted RC HPhad P and Ca contents equal the control diet (phosphorus about 7.5 g andcalcium about 10 g.kg-1), while the diet denoted as RC LP contained less Pand Ca (5.8 g and 6.8 g.kg-1 respectively) than the control and RC HP diets.The diet denoted RC LP+ Phy was supplemented with an enzyme preparationcontaining phytase at a quantity of 875 FYT.kg-1. Application of 15% of rapecake into starter and 20% into grower diets (RC HP) allowed for similar bodyweights and feed conversion ratio as the control group, whereas reduction ofphosphorus and calcium content in the starter diet (RC LP) significantlydecreased body weight at day 21. The addition of phytase to the starter dietwith low level of phosphorus and calcium showed the tendency to improve bodyweight in this period. Application of rape cake into starter and grower dietshad poor effects on fat digestibility in all groups, whereas supplementationof grower diets with a low level of phytase phosphorus and calcium improvedthe digestibility of total phosphorus in comparison to the control and RC HPdiets. A tendency to improve the performance results for diets with rape cake(RC HP) in comparison to the control diet in the second period of fattening(grower diets) was observed. Application of rape cake into the diets had asignificantly beneficial effect on slaughter yield, fleshiness and fatty acidcomposition of meat, but not so on the heart muscle, whereas phytase did nothave an influence on slaughter results. It was concluded that rape cake canbe used in broiler diets, but a quantity of 15% in the starter and 20% in thegrower diet may have a negative effect on the heart of so fed birds.

【 授权许可】

Unknown