Effects of Feeding Siamese neem leaves and Zanthoxylum Pods, on Dry Matter Intake, Dry Matter Digestibility, Milk Production and Composition in Thai Holstein Dairy Cows, Fed Rice Straw as Fiber Source
Effects of Feeding Siamese neem leaves and Zanthoxylum Pods, on Dry Matter Intake, Dry Matter Digestibility, Milk Production and Composition in Thai Holstein Dairy Cows, Fed Rice Straw as Fiber Source
摘要
The plant secondary metabolites （PSM） are highly sought compounds for use as an alternative to conventionally used feed additives in animal production these days; Siamese neem leaf （Azadirachta indica A. Juss. var. siamenses Valeton） and Zanthoxylum pods （Zanthoxylum piperatum） are known to contain numerous such compounds.The objectives of this study were to determine effects of feeding Siamese neem leaf and Zanthoxylum pods as feed additives on dry matter intake （DMI）, dry matter digestibility （DMD） and milk production and milk composition. Lactating Thai Holstein cows （n = 8） were arranged in two replicates of 4 x 4 Latin square designs, housed in individual stall, treatments consisted of Siamese neem 0.5 and 1.5 g kgl dry matter （DM）, ZanthoxylumO. 1 and 0.5 g kg1 DM added to the total mixed ration （TMR）. TMRand drinking water were provided ad lib. There were no significant differences （P 〉 0.05） in DMI and crude protein （CP）, acid detergent fiber （ADF）, neutral detergent fiber （NDF） digestibility, milk production and composition among the treatments.However, significant difference （P 〈 0.05） was observed in dry matter （DM） and ether extract （EE） digestibility. Though statistically non-significant, Zanthoxylum at higher dose level tended to show low DMI （14.85 kg） in cows, while promotingmarginally higher milk （14.18 kg） production as compared with lower dose levelwhere DMI and milk production were 16.14 kg and 13.83 kg.This indicated that Zanthoxylum has a potential to improve feed digestion in dairy cows when used as additives.
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