Effects Of Feeding Models On Behaviours, Blood Indicators And Body Development Of Laying Hens

The ecological Freerange chicken is base on the sustainable development of the agriculture, according to the principle of the ecology and ecologial economics principle, combination the traditional farming method with the modern science and technology, according to the feature of different regions,use the natural resources of the forest land, grassland, garden, farmland ,barren mountain and so on,then combination of the lossing and stocking on a scale .Use a favorable environment, scientific manage[0]ment and health care measures to made them accord to the standardization of production .Make the meet and eggs according to the criterion of the non-environmental damage food, even meet the green food and organic food standards. The use of the plastics canopy on raising hens in the open air,then to study on feeding effect.The results of the experiment have widly significance in the theory of the poultry ecological breed and the actual production.Objective. Three experiments were carried out in this research: to study the effectment of the plastics canopy in the behavior of laying hens,the effectment of the plastics canopy in blood biochemical indicators of laying hens and the effectment of the plastics canopy in body development of laying hens.Methods. In EXP I, 420 non-beak-trimmed hy-line brown chicks were randomly allocated into two experimental treatments:300 in plastics canopy Freerange environment and 120 in cages. Behaviours were recorded by direct observation from 7th to 10th week,and depicted the development curve of behaviors.In EXP II,except the hens in EXP I, add in 200 hens that breed in high-density cage environment.In the primary of 8th,9th,10th,11th week, collection the brood of hens that breed in the plastics canopy and the normal-density cages, randomly choose 4 hens in plastics canopy; randomly choose 4 hens in 4 cages,choose one hen in each cage.In primary of 13th week, collection the brood of hens that breed in the plastics canopy and the normal-density cage, randomly choose 4 hens in plastics canopy; randomly choose 4 hens in normal-density cages and 8 hens in high-density cages, choose one hen in each cage.After the brood collection,use the centrifuge to collection the serum.After preservation in low temperature,use the RIA to measure the content of the ACTH,β-EP and Cort in the hen serum,and use ITA measure the content of the IgA,IgG and IgM.In EXP III, the body development of the hens was measured in the Freerange environment and the cages.In the first day of 7th,9th,11th,13th week, randomly choose 30 hens in each environment, the shank length, shank girth and body weight were measured,then record the data.Results. In Exp I, feeding model had a significantly effect on most behavior patterns. Frequency of feather pecking, preening and laying behaivours in plastics canopy environment are significantly higher than hens in cages, and the foraging and dustbathing just happened in the Freerange environment. Stereotaping, feeding and standing in cage are significantly higher than Freerange environment.Agressing and self-injurying of two environments in all week-old are insignificantly.The feather pecking in Freerange environment during 7th to 10th week-olds show a degree of undulant state,and in cages environment,the state shows increase by degrees in increasing weeks. In EXP I,the feather pecking, preening and stereotaping of two environment were lowest in 7th week-old,and highest in 10th week-old; feeding was highest in 7th week-old ,and lowest in 10th week-old;standing and walking were lowest in 8th week-old ,and laying was highest in that period.In Freerange environment, foraging was highest in 7th week-old ,and lowest in 10th week-old, and the dustbathing were not significantly different between each week-old.In EXP II,except 8th week-old,the IgA,IgM and IgG in serum of the Freerange hens are higher than those in ordinary density cages;each week-old of Freerange hens's ACTH in serum is lower that hens in cages.Except the 8th week-old ,theβ-EP in Freerange hens are lower the hens in cages.The Cort in serum of Freerange hens are lower than hens in cages in 7th and 9th week-old ,and higher in 8th and 10th week-old.The IgA,IgM,β-EP and Cort content of the high density cage hens are not significantly different with other environments, ACTH are significantly different with them,and IgG are significantly different with the normal density hens, not significantly different with the Freerange hens.In EXP III,except the shank length in 6th week-old,all the body development indicators of the Freerange hens are lower than hens in cages.In 8th,10th,12th week-old,the body weight of the Freerange hens are significantly lower than hens in cages,and the shank length are significantly different in 10th and 12th week-old,the shank girth are significantly different in 10th week-old. In 12th week-old,the shank length, shank girth and body weight of the Freerange hens are low 3.33%,2.32% and 9.81% than hens in cages.The CV(Coefficient of Variance) of the shank length and shank girth are reduced when the week-old was increased,and in the same time the uniformity of the shank length and shank girth are increased.Though the CV of the weight were high and the uniformity were low,but with the increasing week-old,the CV were became lower and the uniformity were higher than early period, and those data were reached a better level.Conclusions. 1.Feeding models can effect the behaviours of the laying hens.The animal welfare of the Freerange hens are higher than the hens in cages.2.Feeding models and density can influence the ability of anti-stress and immunity. The Freerange group is best,and followed by the normal density group,the high density group is the worst.3.Feeding models can influence the body development of the hens.The development indicators of the hens in cages are higher that Freerange hens.