Timing of herbage allocation in strip grazing: Effects on grazing pattern and performance of beef heifers.

摘要: The timing of grazing bouts (GB) determines how cattle allot time to meet their nutritional needs. Net photosynthesis and evapotranspirational losses increase herbage nonstructural carbohydrate DM concentrations, which may lead longer more intense GB at dusk. Hence, linking the pattern, plant phenology, allocation emerges as an option manipulate nutrient intake. objectives this work were analyze behavior performance beef heifers when was 0700 each morning (MHA) or 1500 afternoon (AHA). Two pairs experiments conducted during winter spring examining performance. Measurements grazing, rumination, idling times daylight hours, patterns, well bite rate, ADG, change in BCS, daily DMI. In behavioral experiments, 8 strip-grazed annual ryegrass (Lolium multiflorum Lam.). rate measured also analyzed per day. 48 2 groups according treatments. Daily DMI, changes BCS analyzed. AHA increased (P < 0.01) decreased 0.01). concentrated evening, greater rumination varied by day 0.01), but total did not differ = 0.11). With AHA, afternoon. experiment winter, there a treatment x week effect for ADG BCS. Beginning wk 4, gained 150 g BW 0.0145 points than those MHA 0.05) spring, 549 entire 6 wk. DMI (kg/d) (AHA, 5.0 vs. MHA, 4.5) 5.6 5.0). These results suggest that alters patterns; leads has quality, improves