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Traits Analysed

12 traits were analysed in this project as follows:

Calving Ease 
Birth Weight Weight at birth in kilograms, with lower values indicating lighter birth weights. Birth weight was recorded on both steer and heifer progeny in the ASBP.
Gestation Length Length of time in days from conception to birth, with lower values indicating shorter gestation length. Gestation length was recorded on both steer and heifer progeny in the ASBP.
Fertility
Days to Calving Length of days from the start of joining (i.e bull in date) to calving, with lower values indicating shorter days to calving and improved female reproduction. Days to Calving was recorded on the heifer progeny of sires in the ASBP for their first joining as yearlings.
Growth
200 Day Weight Weight in kilograms at 200 days of age (i.e. weaning weight), with higher values indicating heavier weaning weights. 200 Day Weight was recorded on both steer and heifer progeny in the ASBP.
400 Day Weight Weight in kilograms at 400 days of age (i.e. yearling weight), with higher values indicating heavier yearling weights. 400 Day Weight was recorded on both steer and heifer progeny in the ASBP.
600 Day Weight Weight in kilograms at 600 days of age (i.e. 20 months), with higher values indicating heavier yearling weights. 600 Day Weight was recorded on both steer and heifer progeny in the ASBP.
Feed Efficiency
Net Feed Intake – Feedlot (NFI-F) Feed Intake measured in kg of feed intake per day at a standard weight and rate of weight gain, with lower values indicating better feed efficiency through less feed intake for the same weight and rate of weight gain. Net Feed Intake – Feedlot was recorded on all steer progeny in the ASBP at the Tullimba Research Feedlot.
Carcase Composition
Carcase Weight Weight of the hot standard carcase in kilograms at 750 days of age (i.e. 25 months), with higher values indicating heavier carcase weights. Carcase Weight was recorded on steer progeny in the ASBP.
Carcase Eye Muscle Area (EMA) Eye Muscle Area in cm2 in a 400Kg carcase, with higher values indicating larger Eye Muscle Area. Carcase Eye Muscle Area was measured on steer progeny in the ASBP.
Carcase Rump Fat Subcutaneous fat measurement in mm at the P8 rump site in a 400Kg carcase, with higher values indicating more rump fat. Carcase Rump Fat was measured on steer progeny in the ASBP.
Carcase Rib Fat Subcutaneous fat measurement in mm at the 12th and 13th rib site in a 400Kg carcase, with higher values indicating more rib fat. Carcase Rib Fat was measured on steer progeny in the ASBP.
Carcase Intra-muscular fat (IMF) Percentage of intra-muscular fat (ether extracted at the UNE meat science laboratory) in a 400Kg carcase, with higher values indicating more intramuscular fat. Carcase Intra-Muscular Fat was measured on steer progeny in the ASBP.