ORIGINAL PAPER
Forestomach fermentation and microbial communities of alpacas (Lama pacos) and sheep (Ovis aries) fed maize stalk-based diet
1
Shanxi Agricultural University, College of Animal Sciences and Veterinary Medicines, Taigu, Shanxi, 030801, China
Publication date: 2020-12-15
Corresponding author
C. X. Pei
Shanxi Agricultural University, College of Animal Sciences and Veterinary Medicines, Taigu, Shanxi, 030801, China
Shanxi Agricultural University, College of Animal Sciences and Veterinary Medicines, Taigu, Shanxi, 030801, China
J. Anim. Feed Sci. 2020;29(4):323-329
KEYWORDS
TOPICS
ABSTRACT
The aim of the study was to investigate the differences of
forestomach digestion and microbial communities between alpacas and sheep
fed maize stalk-based diet. Six alpacas and six sheep were housed in metabolic
crates, and were fed low-quality diet (30% maize-based concentrate and 70%
rubbed maize stalk) twice a day. The animals were adapted to diet for 18 days,
followed by 3 days of sampling. It was shown that alpacas had lower (P < 0.001)
feed intake than sheep, but presented similar apparent digestibility in the total
tract in comparison with sheep. The concentrations of propionate, valerate,
isobutyrate and isovalerate in alpaca forestomach were higher (P < 0.001)
than those in sheep, whereas acetate and acetate:propionate ratio was lower
(P < 0.001) in alpacas than in sheep. The concentrations of ammonia-N and
microbial protein in alpaca forestomach were 23 and 33% lower than those in
sheep, respectively. For ruminal microbes, the proportions of fibrolytic bacteria
Clostridium and Pseudobutyrivibrio were higher (P < 0.05) in alpacas than those
in sheep, but the proportion of proteolytic bacteria Selenomonas was lower
(P < 0.05) in alpacas. In conclusion, the forestomach fermentation characteristics
in alpacas and sheep fed low-quality maize stalk diet were significantly different,
and this phenomenon may result from the different composition of ruminal
microbes (such as carbohydrate degrading bacteria and proteolytic bacteria).
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