Table 1. Variance analyses for reproduction and production traits.

 Calf Calf
 Source of weaning weaning 205-day
 Variance d.f. Pregnancy Survival age weight weight

 Years 6 0.442** 0.016 2856** 3032** 3389**
 Sex 1' 1352 15661** 17908**
 Dam age 2 0.446* 0.173* 3036* 960 824*
 Sire breed 2 0.302* 0.164 3392* 9212** 5868**
 F, dam breed ++ 2 0.476** 0.048 656 1495* 2358**
 R-AB dams* 1 0.000 0.041 1433 226 54
 R-AC dams 1 0.015 0.024 456 130 482
 R-BC dams 1 0.112 0.038 2194 392 50
 Remainder 571" 0.098 0.056 833 493 249

 td.f. only for production traits.
 tF, dam reciprocals combination.
 *Reciprocal F, dams.
 "Remainder d.f. for survival is 500 and for calf data 468.
 *P < 0.05.
 **P < 0.01.