Growth and development in the pig, with special reference to carcass quality characters. I

摘要: 1. With the object of establishing general order development during post-natal life body proportions, tissues, and anatomical units, relative changes with age in these characters have been studied a series male pigs killed at monthly intervals from birth to 7 months. The study is be regarded light preliminary investigation, providing background experimental studies on influence nutrition growth pig. 2. Growth when measured both photographically by weight individual regions, conforms law developmental direction, exhibiting well-defined anterior-posterior gradient earlier later developing regions. limbs appear as relatively early parts fore slightly than hind. 3. major tissues exhibit marked differential behaviour; skeleton, muscle, fat develop that order. This situation has its origin rates three consequence which skeleton makes greater proportion does while latter still fat. 4. Within any one tissue, units or regions similarly show relationships. Thus, skeletal head trunk an their development, bones each limb centripetal gradient, upper being lower units. To even more degree, muscle surrounding afford evidence similar gradients tissues.