Q.1
The percent NDF in total ration is critical for maintenance of normal milk fat?
- Role of Neutral Detergent Fiber (NDF) in Ruminant Rations:
- Ruminants require an adequate level of dietary effective NDF (peNDF) to stimulate chewing, rumination, and salivary bicarbonate secretion, maintaining rumen pH $\gt 6.0$.
- Adequate rumen buffering favors cellulolytic bacteria, producing an optimal acetate-to-propionate ratio ($\gt 3:1$). Acetate and $\beta$-hydroxybutyrate serve as the essential precursors for de novo fatty acid synthesis in the mammary gland.
- In dairy cattle rations, a total dietary NDF level of $32 - 36\%$ (specifically around $36\%$) is recognized as critical to prevent milk fat depression (MFD).
- nalysis:
- (36 %): Correct critical threshold.
Correct option: (3) 36 %
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