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Effects of precision feeding Holstein and Jersey heifers a gradual increase of dietary poultry fat on nutrient digestibility.

S. M. Hussein




Effects of precision feeding Holstein and Jersey heifers a gradual increase of dietary poultry fat on nutrient digestibility.
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.

The term “precision-feeding” refers to a program that provides heifers with the correct amount of nutrients necessary for adequate growth without affecting future performance. Including poultry fat (PF) can accurately meet caloric requirements and reduce dry matter intake (DMI) when diets are isocaloric and isonitrogenous. However, high fat intake may lead to reduction in fiber digestibility and inadequate rumen fermentation. Yet, reduction of DMI as PF is incorporated into diets can provide similar energy to the animal limiting the negative effects associated with fat inclusion. The objective of this study was to evaluate the effects on nutrient digestion of including different levels of PF inclusion in precision feeding dairy heifers. We hypothesized that including PF would further reduce intake without compromising nutrient digestibility in dairy heifers. Treatments included 55% forage diet with 4 levels of 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)]. Holstein and Jersey heifers were randomly assigned to treatments and administered according to a split-plot, 4 � 4 Latin square design (21-d periods). Data were analyzed using the MIXED procedure of SAS. There were no differences on OM apparent digestibility coefficients (dC) between the Holstein and Jersey-group. However, NDF dC was higher (P < 0.01) in Holstein heifers (68.40 vs. 61.34 � 1.2%), but the Jersey-group had higher ADF (34.15 vs. 44.58 � 1.6%), and N dC (90.01 vs. 92.04 � 0.3%). The inclusion of PF did not affect OM, NDF, and ADF dC. However, the EE and N dC increased linearly with the increased level of PF inclusion. The Holstein-group spent more time to finish their meal (P < 0.05) than the Jersey-group (65.33 vs. 59.94 � 1.6 min), and the PF inclusion showed a linear decrease in the time spent to finish the meal. These results suggest that Holstein utilized NDF more efficiently. In the current study, increasing dietary PF inclusion up to 9% DM reduced DMI without affecting OM and fiber digestibility but increased EE and N dC.

Keywords: precision feeding, poultry fat, heifer.

Biography: My name is Saad M. Hussein, I'm from Baghdad, Iraq, and 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 I graduate if I did not get a nice job.