Table 3.

Nongenetic terms significantly associated with juvenile survivorship

Terms	Data type	d.f.	Δdeviance	P value
Lamb survival (Null model n = 619, deviance = 857.64)
Cohort*	Factor	9	305.83	<0.001
Weight	Continuous	1	7.50	0.006
Sex	Factor	1	3.80	0.051
Treatment†	Factor	2	7.69	0.021
Weight × cohort	Interaction	9	45.04	<0.001
Sex × cohort	Interaction	9	32.54	<0.001
Sex × weight	Interaction	1	8.17	0.004
Residual	—	587	477.68	—
Yearling survival (Null model n = 370, deviance = 489.72)
Cohort*	Factor	9	127.47	<0.001
Weight	Continuous	1	0.87	0.350
Treatment†	Factor	2	6.29	0.043
Sex	Factor	1	15.64	<0.001
Weight × cohort	Interaction	9	28.39	0.001
Residual	—	348	294.53	—

Nongenetic terms fitted to lamb survivorship and yearling survivorship in generalized linear model assuming a logistic error distribution. Significance of terms determined by deletion testing. Change in deviance for lower order terms were calculated by deletion from models not containing higher order terms. 

^*1985–1994 cohorts. 

^†Antihelminthic treated vs. progesterone treated vs. untreated.