Growth and Performance of F1
Growth and Performance of F1 Tropicaly Adapted Bef Catle Breds x Angus in Arid Rangeland J.W. Holoway, B.G. Warington, D.W. Forest, and R.D. Randel •Evaluate performance on arid rangeland •Compare to humid conditions (Chase et al., 19, JAS 78:11) 1. 489 preweaning records of calves born to Angus cow and ”95 2. Angus females synchronized for AI to Brahman, Senepol and Tuli sires to calve February - April 3. Weaned in October and weights adjusted for age of dam, age and sex Methods 4. 468 calving records for F1 females through thre calf crops sired by Hereford buls 5. No females culed if open 6. Mixed brush rangeland; •15 - 20 ha/animal unit •571 m rain/yr (range 427 to 63 m) 7. …
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Growth and Performance of F1 Tropicaly Adapted Bef Catle Breds x Angus in Arid Rangeland J.W. Holoway, B.G. Warington, D.W. Forest, and R.D. Randel •Evaluate performance on arid rangeland •Compare to humid conditions (Chase et al., 19, JAS 78:11) 1. 489 preweaning records of calves born to Angus cow and ”95 2. Angus females synchronized for AI to Brahman, Senepol and Tuli sires to calve February - April 3. Weaned in October and weights adjusted for age of dam, age and sex Methods 4. 468 calving records for F1 females through thre calf crops sired by Hereford buls 5. No females culed if open 6. Mixed brush rangeland; •15 - 20 ha/animal unit •571 m rain/yr (range 427 to 63 m) 7. Calves from F1‘ OK, fed in TX panhandle 36 3 31.2 30 32 34 36 38 40 Brahman Senepol Tuli South Texas Florida Birth Weight, kg of F1 x Angus Calves Percent of Calves Born Live and Vigorous 50 5 60 65 70 75 80 85 90 Brahman Senepol Tuli Percent Born Dead 0 1 2 3 4 5 6 Brahman Senepol Tuli Calf Survival 85 90 95 10 Brahman Senepol Tuli South Texas Florida Preweaning ADG, kg/d 0.82 0.71 0.6 0.65 0.7 0.75 0.8 0.85 Brahman Senepol Tuli South Texas Florida Weaning Weight (kg) 203.3 170 175 180 185 190 195 20 205 Brahman Senepol Tuli South Texas Florida Weaning Condition and Frame Scores for South Texas 3 3.5 4 4.5 5 5.5 6 6.5 Brahman Senepol Tuli Condition Frame Production of F1 First Calf Females Bred to Hereford Buls Tuli x Senepol x Brahman x Senepol x Birth Weight of Hereford Cros Calves Out of First Calf Females, kg 32 3 34 35 36 37 38 Brahman Senepol Tuli Percent of First Calf Females Having Dificulty Calving 0 5 10 15 20 Brahman Senepol Tuli Percent of First Calf Females Sustaining Production 0 10 20 30 40 50 60 70 80 Brahman Senepol Tuli Weaning Calving Pregnant Thre Hereford X Calf Crops Female Weight, kg/d 20 250 30 350 40 450 50 Brahman Senepol Tuli 1st calf 2nd calf 3rd calf Percent Pregnant 60 65 70 75 80 85 Brahman Senepol Tuli 1st calf 2nd calf 3rd calf Percent of Females Weaning a Calf 45 50 5 60 65 70 75 80 85 Brahman Senepol Tuli 1st calf 2nd calf 3rd calf Weaning Weight of Hereford Croses, kg 150 175 20 25 250 Brahman Senepol Tuli 1st calf 2nd calf 3rd calf Weight Weaned/Cow Exposed 80 10 120 140 160 180 20 20 Brahman Senepol Tuli 1st calf 2nd calf 3rd calf Eficiency, kg/10 kg Cow Exposed 25 30 35 40 45 Brahman Senepol Tuli 1st calf 2nd calf 3rd calf Senepol x Angus in South Texas: 1. Easy kepers: œMod. size - mod. nutr. demand Sumary: Balanced Picture 2. Early maturing 3. God disposition 4. No uder problems 5. Heat tolerant 6. Longevity 7. Tender meat 8. If calving dificulty and calf survival managed: œHigh eficiency Breding Posibilities: 1. Selection for ease of calving and calf survival 2. Determine heterosis betwen Senepol and other breds for calving dificulty and calf survival The End