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0.05). The highest and lowest GP at different incubation time, b, IVDMD, IVOMD, estimated ME, SCFA and MP production were observed in the diet supplemented with 10 and 20% WTP respectively (P<0.05). However, rate of GP (c), pH and ammonia-N were similar among WTP-supplemented diets (P>0.05). Overall, results of the present study indicated that WTP improved in vitro gas production, fermentation parameters and nutrient digestibility compared to WS while some of its parameters were comparable to AH.]]>
p. 29−36
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19 mm) were increased with increasing BS proportion in the diets. The degradability characteristics of the silages were evaluated by in situ technique. Both silages were similar in predicted total tract NDF digestibility (TTNDFD = 35 %), 30-h undegradable NDF (uNDF30h = 32 %), NDF digestion rate (kd = 1.8 %/h), but CS was lower in iNDF and higher non fibrous carbohydrates (NFC). Intake of DM was unchanged, but NDF intake was linearly increased with increasing BS levels. Total tract NDF digestibility did not differ among treatments, but DM digestibility linearly decreased with increasing BS proportion. Feeding different ratios of CS: BS did not affect milk yield or milk fat and protein concentration. Furthermore, ruminating time was unaffected by dietary treatments but increasing BS level decreased quadratically the eating and total chewing times. The experimental treatments did not affect plasma β-hydroxybutyric acid and glucose concentrations, but BS increased linearly ruminal ammonia and blood urea nitrogen concentration. The results indicated that BS had a higher iNDF content and a negative impact on DM digestibility and N utilization. However, partial or total substitution of CS with BS led to similar DM intake and milk yield, possibly as a result of similar fiber digestion rate and uNDF30h.]]>
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p. 59−67
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0.05). Despite decreased concentration of milk components, crossbreeding might be recommended in increasing the milk production and the amount of PUFA fatty acids in Qazvini goats.]]>
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p. 79−89
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