Study On Appropriate Diets Lysine Level Of Erlang Mountain Chicken

In this paper, three trials investigated the suitability of Erlang Mountain chicken diet lysine levels. Test one was designed to investigate the effects of two dietary lysine levels and four genetic strains on performance and carcass traits of Erlang mountain chicken. Determine the optimum genetic strain; Text two was Study on Appropriate Diets Lysine Level of the optimum genetic strain Erlang Mountain Chicken; Text three was on the basis of the test two studied the energy and lysine utilization of different dietary feed ingredients and formulations.Experiment1:Effects of Dietary Lysine Levels and Genetic Strains on Performance and Carcass Traits of Erlang Mountain ChickenThis study was designed to investigate the effects of two dietary lysine levels and four genetic strains on performance and carcass traits of Erlang mountain chicken.The experimental design consisted of a4x2x2factorial arrangement with four genetic strains (SD02, SD03,SD03xSD02(SD0302),SD02xSD03(SD0203)), two dietary lysine addition levels (HL:0.15%,LL:0) and two sex for a total of8treatments. One thousand and nine hundred twenty1-day-old Erlang mountain chickens were randomly divided into8treatments with8replicates (4males replicates,4females replicates) and30chickens in each replicate according to body weight and gender. The result showed that there was no significant on feed intake (FI) and mortality between the two lysine treatments (P>0.05). But the final average body weight (BW67) and weight gain (BWG) and feed to gain ratio (F/G) during overall phase (0-67) was increased (P<0.01), and reduced (P<0.01) in high lysine diets was fed (P<0.01).The dietary lysine level had no significant effect on the yield of carcass, eviscerated percentage, left breast percentage, left thigh percentage, final breast color and pH value45min after slaughter (P>0.05). The strain SD02had higher BW28BW67、BWG0-28and BWG0-67than the others (P<0.01).The interaction of lysine, sex and genetic strains was observed to affect0-28days mortality (P<0.05), and50-67days weight gain (P<0.05), BW67and BWG0-67(P<0.01). Comprehensive evaluation of performance and carcass traits, male:SD0302,SD02>SD0203>SD03, female: SD02,SD0302>SD03>SD0203. Experiment2:Effects of Dietary Lysine Levels and on Performance and Carcass Traits of Erlang Mountain ChickenThis study was designed to investigate the effects of five dietary lysine levels on performance and carcass traits of Erlang mountain chicken. The experimental design consisted of a single factorial arrangement with five dietary lysine levels (0-28days:0.95%to1.15%;29～49days:0.8%to1.2%;50～67days:0.65%to1.05%) for a total of5treatments. One thousand and eight hundreds1-day-old Erlang mountain chickens were randomly divided into5treatments with12replicates (6males replicates,6females replicates) and30chickens in each replicate according to body weight. The result showed that there was no significant on mortality and culling rate between the five lysine treatments (P>0.05). Each stage of body weight and body weight gain showed a trend first and then decreased with increasing dietary lysine levels in males and females. The treatment2cock three stages and full stage of body weight, body weight gain are highest, and BW28was significantly different between the treatments (P<0.05). The females treatment2BW28was significantly higher than treatments3and5(P<0.01),BW49was treatment3significantly lower than the others (P<0.05); The males and females BW0-28treatment2was significantly higher than treatments3and5(P<0.01), but the other phases. The feed intake showed the trend first and then decreased with increasing dietary lysine levels of males and females, the males FI29-49treatment2was significantly higher than treatment3,4,5;no significantly with FI0-28,FI50-70and FI0-70,but the treatment2was highest. The males F/G0-28treatment1and treatment3were significantly lower than treatment5, F/G29-49treatment3and5were significantly lower than treatment1and2(P<0.05); the females F/G0-28treatment2was significantly lower than treatment3and4(P<0.05),but the FI29-49and F/G50-70. There was no significantly in carcass traits with dietary lysine levels. Improve the lysine level of dietary could increase the rate of breast muscle and leg muscle percentage of males and females, and reduce the subcutaneous fat thickness. The males eviscerated yield rate treatment4was highest, eviscerated yield with giblet rate treatment3was highest, breast muscle rate treatment4was highest, leg muscle rate treatment3was highest; but the females was treatment4,1,5,2. In conclusion, the recommended values of dietary lysine levels were males:0-28d1.05%,29-49d0.90%,50-70d0.75%; females:0-28d1.05%,29-49d0.90%,50-70d0.95%. Experiment2:Assessment of Erlang mountain chicken energy and lysine utilization in feed ingredients and dietsThis study was designed to investigate the assessment of Erlang mountain chicken energy and lysine utilization in seven feed ingredients and six diets. One hundred and twelve weight closed80-day-old Erlang mountain cocks were randomly divided into14treatments (corn, wheat bran, extruded full-fat soybean,,canola meal, fermentation protein, soybean meal, corn gluten meal,diets1to6and fast group) with8replicates. Gavages to collect feces within48h in order to determine the energy and amino acid utilization, diluted the CP to16%to18%with starch if the CP of ingredient was higher than20%. The result showed that the dry matter digestibility, apparent metabolizable energy, true metabolizable energy and lysine true utilization were highly significant differences between the seven feed ingredients and six diets(P<0.01).The dry matter digestibility of wheat bran minimum only reached27.7%, corn gluten meal up to75.27%, the others were between58.41%to68.68%. Apparent metabolizable energy the wheat bran1646.65kcal/kg was lowest and the corn gluten meal3088.46kcal/kg was highest. True metabolizable energy the wheat bran and rapeseed meal were lowest,the corn gluten meal and diet5were highest. The lysine true availability of soybean meal and wheat bran were94.06%and78.78%lowest, six diets were about91%, the difference was not significant. The measured values lysine true availability were higher than the predicted value among six diets. In conclusion, there was an interaction of nutrients between feed ingredients. The diet digestible lysine requirement were0.81%in29to49days and0.69%in50to70of Erlang mountain cocks.