닭의 우모색과 성장율에 관한 연구 ( The relationship Between Growth Rate and Plumage color of Chickens ) - 농학 > 축산
The primary objectives of this study were to (1) estimate the relationship between plumage color genes and growth rate as it effects the 8 weeks weight and (2) to evaluate the results of previous, study by other workers which indicate that the plumage color genes has an effect on the body growth, This report presents evidence that I, E, B and S in the feather, interact to produce a suppression of body growth rate in chicken. The data used in these studies was obtained from the F_6, F_7, and F_8 crossbred between New Hampshire, Cornish, R. I. Red and white Rock breeds at University of Minnesota Poultry Experiment Station during the 1955 to 1957. Conclusions based on observation from 3,565progeny tested by 7 different types of testings are; (1) The gene inhibiting deposition of black melanin in plumage, gene I effect to suppress body weight at 8 weeks of age. (2) Growth rate to 8 weeks in suppressed further. When the gene responsible for barred plum age, B, is present with genes I and E. (3) I gene interacts with the gene which extends black color E, to suppress body weight at 8 weeks of age however no more than I gene effection. (4) The average effect of I gene is to suppress body growth by 37 grams in female and 81 grams in males in 900 grams to 1100 grams chickens at 8 weeks of age. The average effect of I and E, is to suppress body growth by 23 grams in fe males and 40 grams in males in 885 grams to 1065 chickens at 8 weeks of age. Body weight at this ags is further reduced by I and E, B to 45 grams to 53 grams as compared to those chickens having the ii and e alleles in 890 to 1070 grams chickens. Three boars of Berkshire, Daros Jursey, and Chester White were tried to test the quantitie and qulity of the fractioned boar semen by laboratory techniques. All of the experiments were worked out by simple factorial design and tested by analysis of variance as to wether they were significantly different or not. Further more, they were checked by L.S.D, for nine items, There are highly significant (F$lt;0.01) in the boars and the splits for gelatinous portion and its percentages, in the boar differences for perm concentration, live and dead sperms, and punting interval time. By splitting the boar emens there are significant (F$lt;0.05) for M.R.T. and low significant (F$lt;0.05) for total volume, sperm concentration, sperm abnormality, in general the liquid portion, sperm abnormality, live and dead, total volume, M.R.T. interval time, sperm concentration, percentage of gelatinous portion, and gelatinous portion in this order, were significantly differences in this test. These tests were rather small samples and showed only to be differentiate the boar semen in the physical condition by the Fractional Hand collection and to be differed by individuality.
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