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Effects of precision feeding Holstein and Jersey heifers an increasing poultry fat inclusion on rumen fermentation parameters.

S. M. Hussein


Effects of precision feeding Holstein and Jersey heifers an increasing poultry fat inclusion on rumen fermentation parameters.
S. M. Hussein*1, S. Twyman1, M. Toledo1, O. Thomas1, J. Echesabal1, R. M. Stockler2, M. J. Aguerre1, G. J. Lascano1. 1Clemson University Clemson, SC, 2Auburn University Auburn, AL.

Fat inclusion can increase energy density of diets fed to ruminants, therefore reducing dry matter intake (DMI) required to meet caloric demands, however detrimental effects to rumen fermentation have been reported. There is evidence that not all fat sources have this negative response. Diets used for precision-feeding are more nutrient dense, allowing an increase in energy and nutrient utilization efficiency while decreasing nutrient loss. We hypothesized that including poultry fat (PF) would reduce intake without compromising rumen fermentation in dairy heifers. Four Holstein and 4 Jersey cannulated heifers were randomly assigned to 4 treatments, included 55% forage diet with 4 increasing PF inclusion starting with a basal concentration of fat in the diet [3% fat (0% PF); 5% fat (2% PF); 7% fat (4% PF); and 9% fat (6% PF)]. Treatments administered according to a split-plot, 4 � 4 Latin square design for 4 periods of 21 d [(16 d adaptation, (5 d sampling; rumen sampling were collected on the last day of each period)]. Data were analyzed using the MIXED procedure of SAS with fixed effects of period, breed, PF inclusion, breed � PF interaction, and a random effect of heifer (breed) and repeated measures when needed. There were no differences on rumen VFA between the Holstein and Jersey-group. Total VFA concentration and acetate molar proportion decreased linearly with the increased level of PF inclusion. Concurrently, there was a linear increase in propionate molar proportion resulting in a linear reduction on the A:P ratio with PF incremental inclusion. Iso-butyrate molar proportion increased linearly as PF increased. Mean rumen pH was not affected by breed, but the PF inclusion showed a linear increase on rumen pH (P < 0.03). Rumen NH3-N concentration was not affected by breed, but PF inclusion resulted in an increasing linear trend on rumen NH3-N (P = 0.10). These results suggest that Holstein and Jersey heifers had a similar pattern and rate of rumen fermentation and that increasing PF inclusion in precision feeding program is affecting rumen fermentation pattern mainly by reducing the A:P.

Keywords: precision feeding, poultry fat, heifer.

Biography: My name is Saad M. Hussein, I'm from Baghdad, Iraq, a PhD candidate in animal and veterinary sciences (Ruminant Nutrition) at Clemson University in South Carolina. Expected to graduate in December 2020. I would like to do a postdoc after graduation if I do not find a nice job.