Effects And Study Of Different Phosphorus Levels And The Calcium To Phosphorus Ratios On Performance, Carcass Quality And Blood Index In Strain Wild Boar

Forty two day old strain Wild Boars with 50% consanguinity were selected in this experiment,the whole experiment period was divided into two parts,one part was pre-experiment which was 7 days and another part was formal experiment which was 83 days. A 2×3 factorial design was used in the experiment. Wild Boars were assigned randomly to three phosphorus levels(0.4%,0.6%,%0.8) reatments and three calcium to phosphorus ratios (1:1,1.25:1,1.5:1) reatments (4 repetitions for each treatment , one pig for each repetition).Growth performance: Phosphorus level and calcium to phosphorus ratio had no significant effect on the consumption of feed,daily gain and the ratio of feed to gain ( P>0. 05).There was no interaction of phosphorus levels and calcium to phosphorus ratio ( P>0. 05).Blood biochemical index: there were obvious differences between the phosphorus level in 0.4% and 0.6% on serum calcium level(P<0.01); there were obvious differences between the phosphorus level in 0.4% and 0.8% on the serum calcium level(P<0.01). Calcium to phosphorus ratio had significant effect on the serum calcium level (P<0.01).There was interaction of phosphorus levels and calcium to phosphorus ratio on serum calcium level (P<0.01).Serum phosphorus level is lowest with phosphorus level 0.4%,and highest with phosphorus level 0.8%, the level of serum phosphorus of the two groups(phosphorus level 0.8% and 0.6%) was significantly greater than the group (phosphorus level is 0.4%)(P<0.01),but there was no obvious difference between the groups (phosphorus level in 0.6% and 0.8%)on serum phosphorus level(P>0.05).In the three groups (calcium to phosphorus ratio 1:1 ,1.25:1, 1.5:1), there were obvious differences between the groups(calcium to phosphorus ratio 1:1 ,1.5:1)on serum phosphorus level(P<0.05),but no obvious difference between the groups( calcium to phosphorus ratio, 1.25:1 and 1:1 ) ( P>0. 05).The interaction of phosphorus and the ratio of calcium to phosphorus had significant effect on the the serum phosphorus level ( P<0. 05). As calcium to phosphorus ratio in diet increases from 1:1 to 1.5:1, There was no significant difference in the activity of serum AKP between the two groups(calcium to phosphorus ratio 1:1 and 1.25:1) ( P >0. 05), also the two groups(calcium to phosphorus ratio 1:1 and 1.5:1 ), and the same to another two groups(calcium to phosphorus ratio 1.25:1 and 1.5:1 ); significant difference was found in the activity of serum AKP between the two groups(0.4% phosphorus level and 0.6% phosphorus level) (P<0.01). As phosphorus level in diet increases from 0.6% to 0.8%, the activity of serum AKP changed very little,no obvious difference( P>0.05).The activity of Small Intestine AKP and Costal Bone AKP: phosphorus level had no significant effects on the the activity of Duodenum AKP ( P>0. 05) ; calcium to phosphorus ratio had no significant effect on the activity of Duodenum AKP ( P>0. 05). Compared with the groups (0.6%, 0.8% phosphorus level), the activity of skeleton AKP with phosphorus level 0.4% was the highest(P<0.01), no significant difference was found in the activity of serum AKP between the two groups (0.6% and 0.8% phosphorus level) (P>0.05),The calcium to phosphorus ratio had no significant effect on the skeleton AKP(P>0.05)Skeleton index: phosphorus level and calcium to phosphorus ratio had no significant effect on the length of the sixth rib (P>0.05), calcium to phosphorus ratio had no significant effect on the fresh weights of the sixth rib (P>0.05),but phosphorus level had significant effects on the fresh weights of the sixth rib(P<0.01). Different phosphorus levels had significant effects on the bone ashes Content of the sixth rib(P<0.01). The Content of bone ashes with calcium to phosphorus ratio 1.5:1 was higher than the groups with calcium to phosphorus ratio 1.25:1 and 1:1,but no no obvious difference ( P>0. 05). Different phosphorus levels and calcium to phosphorus ratios had no significant effects on the bone ashes calcium Content of the sixth rib ( P >0. 05). Different phosphorus level had significant effects on the phosphorus Content of bone ashes(P<0.01). There were obvious differences between the calcium to phosphorus ratio 1:1 and 1.25:1 on the the phosphorus Content of bone ashes of the sixth rib (P<0.01), also obvious differences between 1:1 and 1.5:l(P<0.01), but no obvious difference between the 1.25:1 and 1.5:l(P>0.05). Different phosphorus levels (0.4%, 0.6%, 0.8%) and Different calcium to phosphorus ratios(l:1, 1.25:1,1.5:1) had no significant effect on the calcium to phosphorus ratio of bone ashes ( P >0. 05). Meat quality index: phosphorus level and calcium to phosphorus ratio had no significant effect on meat color,water holding capacity (WHC) and muscle marble stripe ( P >0. 05). as calcium to phosphorus ratio raised to 1.5:1 from 1:1, muscle tenderness was decreased , but there was no significant difference to muscle tenderness (P>0.05), there were significant differences between two groups(calcium to phosphorus ratio 1:1 and 1.5:1) for muscle tenderness;Different phosphorus level(0.4%,0.6%,0.8%) had no significant effect on diameter of muscle fiber; as calcium to phosphorus ratio raised to 1.5:1 from 1:1, diameter of muscle fiber decreased significantly(P<0.01).Carcass parameters: phosphorus level and calcium to phosphorus ratio had no significant effect on dressing percentage,lean meat percentage and the eye muscle area (P >0. 05).