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- W109889737 abstract "Scrotal circumference has long been regarded as a readily-measured indicator of beef bull fertility and is therefore routinely included in bull breeding soundness examinations. However, concerns have been raised that current minimum thresholds for tropically adapted genotypes do not account for the large variations in northern Australia bull nutrition. The primary objectives of this study were to examine the interaction and effects of weight and age on scrotal circumference and to develop minimum thresholds indicative of suboptimal testicular development. Scrotal circumference measurements (n = 9300) from 1958 bulls £3 years of age, were analysed. Breeds included Brahman (n = 559), Droughtmaster (n = 133), Santa Gertrudis (n = 460) and other tropical composites (n = 806). The bulls were located on multiple sites across Queensland, and most continuously grazed native or improved pastures of varying quality, with some receiving commonly-used supplements. Some bulls were lot fed for a period to achieve growth rates of approximately 1 kg/day. Both weight (r = 85.8%) and age (r = 78.5%) had significant positive correlations with scrotal circumference. The Gompertz function, a relatively common non-linear model used to describe growth, best described testicular development in relation to weight in all breeds (R2 = 80.4). Breed differences in testicular development were small, although tropical composite bulls matured at a slightly earlier age/weight than the other breeds studied. The minimum recommended scrotal circumference within weight ranges were derived for field use as less than the lower 5th percentile (Table 1)." @default.
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- W109889737 date "2012-01-01" @default.
- W109889737 modified "2023-09-26" @default.
- W109889737 title "Recommended minimum scrotal circumference for tropically-adapted beef bulls in northern Australia" @default.
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