Effect of NDF levels of complete pelleted diet and dietary transition period on rumen pH, growth per

منبع:

https://www.sciencedirect.com/science/article/abs/pii/S0921448823001359?dgcid=raven_sd_aip_email

https://www.dairynz.co.nz/media/5790741/technote-8_web.pdf

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Abstract

This study aimed to evaluate the effects of low and high NDF levels in complete pelleted diets (CPD) on early diet transition in fattening male goats. Forty male goats were blocked by their initial body weights (BW), and within each block, animals were randomly assigned to one of the four diets using a randomized complete block design. The treatments were arranged in a 2×2 factorial comprising of two levels of NDF (20.2% and 32%) and two diet transition strategies (day 7 and 15). All the diets were iso-nitrogenous, having a 15:85 forage-to-concentrate ratio. In the high NDF diet, a higher level of 32% was achieved by replacing corn grain with soy hulls and wheat bran. The goats were housed individually and had ad libitum access to feed and water. During the transition phase, conventional feeding was replaced by the CPD in three steps, and thereafter, all animals had free choice access to their respective diets. Body weight and blood samples were conducted weekly, while rumen samples were collected on day 0, 7 and 15, and then fortnightly. Feeding behavior data was recorded on day 7 during the transition period using video cameras. Nutrient digestibility was performed twice, with n=4 animals/treatment: 1) after 15 days and 2) at the end of the study. The results revealed that goats fed on a high NDF diet had higher (P 0.05) DMI and ADG than those fed on a low NDF diet during the transition. Additionally, there was an interaction between NDF and transition days after the transition period and the entire study period. The feed-to-gain ratio was lower (P = 0.05) in goats fed on the LNDF-15 compared with the LNDF-7. The rumen pH of low NDF-7 goats was lower (P 0.05) throughout the study compared with other treatments. Moreover, the odds for diarrhea were higher (P = 0.03) in the low NDF-7 goats compared to other treatments during and after the diet transition. Male goats fed on a high NDF diet had higher (P 0.05) nutrient digestibility after transition, but no effect thereafter. Animals fed on a high NDF diet had higher (P 0.05) DMI, NDF intake, laying, standing time, and rumination time during the diet transition period. Feeding behavior was not recorded after the dietary transition period. In conclusion, feeding HNDF-7 to goats during the diet transition period resulted in improved growth performance, key feeding behavior parameters, and nutrient digestibility. Whereas, during the post-diet transition period, both LNDF-15 and HNDF-7 goats displayed comparable growth performance without any adverse effects on animal health.

Keywords:NDF level,diet transition,rumen pH,production performance,feeding behavior.