Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effects of roughage quality, period of day and time lapse after meal termination on rumen digesta load in goats and sheep

  • Moyo, Mehluli (Animal and Poultry Science, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal) ;
  • Adebayo, Rasheed Adekunle (Animal and Poultry Science, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal) ;
  • Nsahlai, Ignatius Verla (Animal and Poultry Science, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal)
  • Received : 2017.04.28
  • Accepted : 2017.07.28
  • Published : 2018.08.01
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Abstract

Objective: This study ascertained effects of roughage quality, period of day at meal termination and time lapse after feeding on digesta load in the rumen. Methods: Veld hay was untreated (poor roughage quality, PRQ), improved (improved roughage quality, IRQ) by treating with urea or semi-improved by spraying with urea (semi-improved roughage quality, SIRQ). Experiment 1a used four rumen fistulated sheep to determine in-sacco degradability. Twelve sheep ($56.3{\pm}4.59kg$) were blocked by weight and randomly allocated to IRQ (n = 6) and PRQ (n = 6) to determine solid and liquid passage rates. In experiment 1b, nine sheep ($37.6{\pm}9.34kg$) were blocked by weight and randomly allocated to IRQ (n = 4) and PRQ (n = 5) to determine digestibility. Sixteen sheep ($36.47{\pm}9.46kg$) were blocked by body weight and randomly allocated to IRQ (n = 8) and PRQ (n = 8). Two sheep were slaughtered for each sampling time in each treatment (IRQ and PRQ) at 0, 6, 12, and 24 h after feeding to determine rumen load. In experiment 2, eighteen goats ($25.4{\pm}9.08kg$) were blocked by weight and randomly allocated to IRQ (n = 6), SIRQ (n = 6), and PRQ (n = 6). Then all 18 goats were slaughtered soon after meal termination in the morning; afternoon and evening to determine the effect of period of day on rumen fill. Results: Rate of degradation and effective degradability were enhanced by improvement of roughage quality. Roughage quality had no effect on digestibility, but digestibility was higher in goats than sheep. Fractional passage rate of particles was higher for IRQ than PRQ, but similar for liquids. Digesta fractional clearance rates at 24 h after feeding were 0.018/h (IRQ) and 0.006/h (PRQ). Period of day had an influence on rumen load. Neutral detergent fibre load for goats were above 2.03 kg/100 kg body weight for all diet treatments. Conclusion: Following starvation, passage rate had negligible effects on emptying of rumen load.

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References

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