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Adjustment Factors for 90-Day Lamb Weight^{1, 2,}

The Ohio Agricultural Research and Development Center, Wooster 44691

Abstract

Field data on 7,166 purebred lambs of seven breeds were used to determine the effects of age of ewe, type of birth, type of rearing, sex and season of birth on 90-day, age-corrected weight, both within and among breeds. Least-squares analyses showed that all the above effects, as well as flock, year of birth and the interactions of age of ewe with type of rearing and of breed with type of birth, type of rearing and season of birth were signiFicant (P <.05).

Adjustment factors for these effects were developed and compared to those given in the National Extension Sheep Committee Report of 1968, which tended to underestimate the effects of type of birth or rearing and overestimate the effects of age of ewe in these data. Differences of up to .13 were found in multiplicative adjustment factors among those breeds with over 1,000 records, implying that the use of separate adjustment factors for different breeds would be desirable.

¹ Published with approval of the Director as Paper No. 89-73, Journal Series. The Ohio Agricultural Research and Development Center.

² This research was completed by the senior author as partial requirement for the B.S. degree in the Honors Program in Agriculture, The Ohio State University.

³ Animal Science Department, University of Nebraska, Lincoln, 68503.

⁴ Animal Science Department, The Ohio State University, Columbus, 43210.