Microbial digestion in the alimentary tract. The nature of dietary protein in relation to its utilisation by the ruminant.

Ruminal microflora is closely correlated with the ruminant’s diet. However, information regarding the effect of high concentrate diets on rumen microflora in yaks is lacking. In the current study, 24 healthy male yaks were randomly assigned to two groups, each fed with different diets: less concentrate (LC; concentrate: coarse = 40: 60) and high concentrate (HC; concentrate: coarse = 80: 20) diets. Subsequently, a 21-day feeding trial was performed with the yaks, and rumen fluid samples were collected and compared using 16 s rRNA sequencing. The results showed that NH3-N, total VFA, acetate, butyrate, isobutyrate, and isovalerate were significantly higher in the HC group than that in the LC group (p < 0.05), while microbial diversity and richness were significantly lower in the HC group (p < 0.05). Principal coordinate analysis indicated that rumen microflora was significantly different in LC and HC groups (p < 0.05). In the rumen, phyla Firmicutes and Bacteroidota were the most abundant bacteria, with Firmicutes being more abundant, and Bacteroidota being less abundant in the HC group than those found in the LC group. Christensenellaceae_R-7_group and Prevotella are the highest abundant ones at the genus level. The relative abundance of Acetitomaculum, Ruminococcus, and Candidatus_Saccharimonas were significantly higher in the HC group than that in the LC group (p < 0.05), while the relative abundance of Olsenella was significantly lower in the HC group than in the LC group (p < 0.05). Compared to the LC group, the relative abundance of Prevotella, Ruminococcus, and Candidatus_Saccharimonas was significantly higher in the HC group. The relative abundances of Prevotella, Prevotellaceae_UCG-003, Olsenella, Ruminococcus, Acetitomaculum, Candidatus_Saccharimonas, and NK4A214_group were correlated with ruminal fermentation parameters (p < 0.05). Furthermore, PICRUSt 2 estimation indicated that microbial genes associated with valine, leucine, and isoleucine biosynthesis were overexpressed in the rumen microflora of yaks in the HC group (p < 0.05). Conclusively, our results suggest that high concentrate diets affect the microflora composition and fermentation function in yak rumen. The present findings would provide new insights into the health of yaks under high concentrate feeding conditions and serve as a potent reference for the short-term fattening processes of yaks.

/pdf/effects-of-high-concentrate-rations-on-ruminal-fermentation-2kh7h4uk.pdf

Effects of high concentrate rations on ruminal fermentation and microbiota of yaks

This research’s objective was to determine the dietary rumen degradability and growth performances of goats fed dietary treatments. Eighteen (18) female goats were grouped into 6 weight classes for the feeding trial experiment, the average BW of the animals that were used was about 7.96 ± 2.21 kg (CV - 27.76%) and were approximately 1 year of age. For the in situ digestibility, three (3) male mature goats surgically fitted with cannulated rumen were used. Three (3) dietary treatments were used for all studies as follows: T1 - 72 : 28  NDF Forage-Concentrate Ratio; T2 - 64 : 36; T3 - 57 : 43. A RCBD was applied for Feeding Trial and a 3 x 3 LSD was used for In Situ Study. Treatments 1, 2 and 3 did not affect the rate of rumen degradability of DM, NDF and CP at 0 hours, potentially degradable fraction (b) and the rate of degradation of b. The treatments affected the intake rate of forage and concentrates on the DM, CP and NDF. However, the total intake of DM, CP and NDF were not affected by the treatments. Growth performance of goats used in this experiment was not affected by the treatments as indicated by the similar production and efficiency. This means that diets given to native goats with ratio of NDF forage of 72.07% can be applied since the value of the output and efficiency of feed utilization had the same value compared to diets ratio of NDF forage of 57.21%. Key Words: NDF Forage, Ration, Goat

https://medpub.litbang.pertanian.go.id/index.php/jitv/article/download/336/345

The effects of dietary neutral detergent fiber ratio on the rumen degradability and growth performance of Philippine native goats (Capra hircus Linn.)

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The effects of dietary neutral detergent fiber ratio on the rumen degradability and growth performance of Philippine native goats (Capra hircus Linn.)