Comparative Study On Tissue, Organ Growth And Development Between Hybridized F1 Generation And Three Kinds Of Pure Breed Lamb

In this experiment,Hybridizations were made making use of Suffolk and Dorset male sheep and Mongolia female sheep which are superior variety in meat breed. During the developmental period of 6 month,the developmental situations were observed for the Hybridized F1 Generation and Three Kinds of Pure Breed Lamb.The results indicate:the body weight of the pure breed Dorset and pure breed Suffolk were all very notably hyper correspond month age body weight of hybridization generation and purebred Mongolian sheep.For female lamb which lasted 6 month from birth, average daily adding weightiness of offspring of pure breed Suffolk,pure breed Dorset,hybridization Dorset,hybridization Suffolk and pure breed Mongolian sheep is 218.2g,214.2g,181.0g,170.7g and 131.55g respectively.The weightiness adding is significantly different between the hybrid offspring and pure breed Mongolian sheep. For male lamb which lasted 6 month from birth,average daily adding weightiness of offspring of pure breed Suffolk,pure breed Dorset,hybridization Suffolk, hybridization Dorset and pure breed Mongolian sheep is 205.8g;259g,182g,189.2g and 151g respectively.The weightiness adding effect is very different within the hybridized and pure Mongolian lambs.After 6 month breeding,the carcass characteristics of the lambs were measured which including the weight,length, antero-width,retro-width,girth of half carcass,dorso-fat thickness etc..The data analysis shows that all characteristics of the hybridized F1 Generations were better than pure breed Mongolian Sheep,but no difference between the hybridized F1 Generation of Suffolk and Dorset.The fat weight of Two kinds hybridized was lower than pure breed Mongolian sheep.The net meat rate of six month hybridized F1 Generation of Dorset,Suffolk and Mongolian was separately 75.23%,75.84%and 74.46%.There was no statistical difference in carcass net meet rate.The dressing percentage of six month pure breed Mongolian Sheep,hybridized F1 Generation of Dorset and Suffolk sheep was 41.74%,42.40%and 45.01%respectively,the dressing percentage of hybrid F1 Generation of Suffolk sheep is higher than Mongolian Sheep. The average net meat weights of two kinds of six month hybridized sheep were higher than pure bred Mongolian sheep.