Studies On Requirements Of Calcium And Phosphorus For Yangjiang Geese

The experiment was investigated the effects of different calcium(Ca) and non-phytate phosphorus(NPP) levels on production performance, serum biochemical indicators, slaughter performance, nutrient apparent metabolizability, and the growth of tibia, crude ash, calcium and phosphorus contents in tibia of Yangjiang geese. The purpose of experiment was to determinate Ca and NPP requirements of Yangjiang geese from1to70day of age.2161-day-old Yangjiang geese with healthy and similar body weight, were randomly allotted to9dietary treatments, each dietary treatments was replicated3times, and each replicate with8geese. The experiment involved3x3(Ca*NPP) factorial arrangement, consisting of3levels of dietary calcium(0.60%,0.80%, or1.00%) and3levels of non-phytate phosphorus(0.30%,0.45%or0.60%). The results of the experiment were showed as follows.1. Production performance:The influences of different levels of dietary calcium and non-phytic acid phosphorus on the average daily gains (ADG), daily feed intake (ADFI) were significant (p<0.05), and the interaction of calcium and phosphorus influenced the ADG, ADFI and feed to gain ratio (F/G) significantly(p<0.05) in green goose phase.In whole trial period, The effect of different levels of dietary calcium and phosphorus on ADG, ADFI and F/G, were not significant(p>0.05), the interaction of calcium and phosphorus influenced the ADG, ADFI and F/G significantly(p<0.05). The suitable dietary Ca and NPP requirements were0.80%Ca and0.45%NPP respectively.2.Serum biochemical indicators:Different levels of dietary Ca did not significantly affect the serum calcium and phosphorus(p>0.05), but the effects on serum alkaline phosphatase(ALP)activity were significant(p<0.05). Different levels of dietary NPP did not significantly affect the serum calcium, phosphorus and ALP activity (p>0.05). The interaction of calcium and phosphorus did not influence significantly the serum Ca and P contents(p>0.05), but on the serum ALP activity was significant(p<0.05). The ALP activity of Ca and NPP treatment0.80%Ca and0.45%NPP was lowest.3. Slaughter performance and dietary nutrient apparent metabolizability:The influences of different levels of dietary Ca and NPP on the dressing percentage, eviscerated percentage, eviscerated with giblet percentage, breast muscle percentage and leg muscle percentage were not significant(p>0.05). The interaction of calcium and phosphorus influenced significantly the dressing percentage(p<0.05), however, on the eviscerated percentage, eviscerated with giblet percentage, breast muscle percentage and leg muscle percentage were not significant(p>0.05). The influences of dietary different levels of Ca on the Ca apparent metabolizability was significant(p<0.05), but on the P apparent metabolizability was not significant(p>0.05) in green goose and gosling. The influences of different levels of NPP on the Ca and P apparent metabolizability were not significant(p>0.05). The interaction of calcium and phosphorus influenced significantly the Ca and P apparent metabolizability of green goose and Ca apparent metabolizability of gosling(p<0.05), but P apparent metabolizability was not significant(p>0.05).The best was dietary0.80%Ca and0.45%NPP.4. The growth, crude ash, calcium and phosphorus contents in tibia:The influences of different levels of dietary Ca and NPP on the length and dry weight of tibia of Yangjiang geese were not significant (p>0.05), and the interaction of calcium and phosphorus did not influence significantly the length and dry weight of tibia(p>0.05). The influences of different levels of dietary Ca and NPP on the tibia crude ash, Ca and P contents were significant(p<0.05). The interaction of Ca and NPP influenced the crude ash, Ca and P contents of tibia significantly (p<0.05). The best was dietary0.80%Ca and0.45%NPP.In conclusion, the suitable dietary Ca and NPP requirements for Yangjiang geese from1to70day of age were0.80%Ca and0.45%NPP respectively,and the suitable Ca/NPP was1.78:1.