Technical annual report 2000-01
Dept. of Regional Development, Primary Industry, Fisheries and Resources technical annual report; Department of Regional Development, Primary Industry, Fisheries and Resources technical and annual report; Reports; PublicationNT; Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295
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Agriculture -- Northern Territory -- Periodicals; Fisheries -- Northern Territory -- Periodicals
Dept. of Primary Industry and Fisheries
Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295
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Department of Primary Industry and Fisheries 54 Method: This was described in some detail in the Technical Annual Report for 1998/99 and will not be repeated here. Two replicate blocks (Finch and Quail) stocked at 120 animals/6 km2 provided the experimental data; the cattle in this analysis were a subset of those present in each block. The Hi weight range animals weighed more than 160 kg at weaning and the Lo weight range weaners weighed 100 160 kg. All weaners were from the first weaning round (June). The average weaning weights and the weaning weight ranges of the Kidman and the Mt Sanford derived weaners were similar. Experimental animals grazed from weaning until the end of their first post-weaning Wet. Results 1999/2000, 2000/2001: Table 1. The property of origin of the weaners, their genotype and the numbers involved in this analysis Genotype Number Weaner growth (kg/head) P8 mm Kidman Droughtmaster Brahman (k) Charolais 29 37 31 122.6a 116.2b 127.5a 3.8ab 3.1a 2.7a Mt Sanford Lo weight range Hi weight range 73 65 120.8ab 108.7c 2.8a 4.2a Within columns, groups with different superscripts were significantly different. For growth: The difference between the Kidman and Mt Sanford Brahmans was negligibly small. The Droughtmasters and the Charolais grew 6.4 kg/head (5.5%) and 11.3 kg/head (9.7%) respectively, more than the Kidman Brahmans. Hi weight range weaners grew 12.1 kg/head (10.0%) less than the Lo weight range weaners. These differences between the Kidman weaner genotypes are very similar to those recorded in the experimental feedlot at Katherine Research Station and in the grow-out phase genotype comparison on improved pasture (buffel) at Douglas Daly Research Farm. For P8 Fat Depth: The Droughtmasters were fatter than both sources of Brahman. The Charolais were leaner (and larger) than all other genotypes. The Hi weight range was fatter than the Lo weight range (4.5 mm vs 2.8 mm). The optimum fat depth for slaughter for Indonesian wet markets is about 3 mm. Conclusions: The differences in growth and fatness between the two Brahman samples (Kidman and Mt Sanford) was negligibly small (i.e. they were of very similar mature size).