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유우의 부분기록에 대한 이용효율을 높이기 위한 회귀계수 추정
도창희,오봉국,이정구,이문연 ( C . H . Do,B . K . Ohh,J . K . Lee,M . Y . Lee ) 한국축산학회 1986 한국축산학회지 Vol.28 No.3
This study was carried out to estimate regression factors for extending partial records to 305-day records from data which were collected from 6 Holstein herds from 1969 through 1984. The records were pre-adjusted for the effect of herd, year, month of calving, and parity. The results obtained are as follows: 1. The best single month for estimating a complete lactation was the 5th or 6th months (R=0.87), while regression factors developed from sequential monthly records for extension were available over the first 5 monthly records (R=0.92-0.99). 2. Multiple regression factors by the use of each monthly record were more available over the fast 4 monthly records (R=0.91-1.00) and appeared to be substantially more precise than single monthly regression factors and cumulative monthly regression factors. 3. Regression equations including the last monthly record to estimate the remaining part were more available when the unknown part period was short.
국내 홀스타인종 유우의 부분산유기록을 확장하기 위한 비율계수 추정에 관한 연구
도창희,오봉국,이정구,이문연 ( C . H . Do,B . K . Ohh,J . K . Lee,M . Y . Lee ) 한국축산학회 1986 한국축산학회지 Vol.28 No.3
Ratio factors for extending partial records to 305day were estimated on 3,740 complete lactation rewrds collected from 6 Holstein herds from 1969 through 1984. The results obtained are as follows: 1. The single monthly ratio factors were higher in the late stage than in the early stage, and higher for the 1st parity than the 2nd, 3rd and later partities. The value of R² of the factors was relatively high in the middle stage (4th-7th month). 2. The cumulative monthly ratio factors were also higher for the 1st parity than the other parities, and lower in July through October than in the other months. The value of R2 of the factors increased as monthly tests continued; and over 0.80 if the number of monthly test record included more than 5. 3. The ratio factors for the period of unknown part on the last monthly yield decreased while the value of R² of the factors increased as the period of unknown part became short.