Abstract #M332

Section: Ruminant Nutrition
Session: Ruminant Nutrition: Beef I
Format: Poster
Day/Time: Monday 7:30 AM–9:30 AM
Location: Gatlin Ballroom

# M332
Effects of essential oils and exogenous enzymes for finishing Nellore cattle in feedlot during the adaptation period.
Murillo Alves Porto Meschiatti¹, Diandra Leziér¹, João Ricardo Rebouças Dórea², Tiago Sabella Acedo^*2, Luis Fernando Tamassia², Cristina Simões Cortinhas², Flávio Augusto Portela Santos¹, ¹University of São Paulo, Piracicaba, SP, Brazil, ²DSM Produtos Nutricionais Brasil SA, São Paulo, SP, Brazil.

The objective with this trial was to evaluate the combination of essential oils and exogenous enzymes during the adaptation period on performance of Nellore bulls finished in feedlot. Three hundred Nellore bulls (initial BW = 330 ± 33 kg) were fed diets containing 82.5% corn, 8.5% sugarcane bagasse, 5% soybean meal, 3% mineral, 1% urea and were randomly allocated to 50 pens. Animals were blocked based on initial BW. The treatments were MON (Monensin, Tortuga – 26 mg/kg DM), CRINA (Essential Oils: Crina Ruminants, DSM – 90 mg/kg DM), CRINA+MON (90 and 26 mg/kg DM, respectively), CRINA+RUM (CRINA + α-amylase: Ronozyme RumiStar, DSM – 90 and 560 mg/kg DM, respectively) and CRINA+RUM+P (CRINA+RUM+Protease: Ronozyme Proact, DSM – 90; 560 and 840 mg/kg DM, respectively). Response variables included: dry matter intake (DMI), average daily gain (ADG), feed efficiency (FE, G:F) after 28 d on feed. The data were analyzed using PROC MIXED of SAS and means were compared by Tukey test considering the block as random effect and treatments as fixed effects. Cattle fed CRINA and CRINA+RUM diets presented greater (P < 0.05) DMI in comparison with the other treatments. The improvements on DMI were 7.8% and 9.1% for CRINA and CRINA+RUM, respectively, compared with MON. For ADG the improvements were 14.5% and 23.3% for CRINA and CRINA+RUM, respectively, compared with MON. Feed efficiency was greater (P < 0.05) for cattle fed CRINA+RUM diets. In conclusion, the use of essential oils and its combination with amylase improved DMI, ADG during the adaptation period. Nellore bulls were 12.4% more efficient when diets containing Amylase and essential oils were fed compared with monensin diets. Table 1. Combination of essential oils and exogenous enzymes on feedlot performance of finishing Nellore bulls during the adaptation period

Parameter	MON	CRINA	CRINA+MON	CRINA+RUM	CRINA+RUM+P	P-value	SEM
Initial BW, kg	330.8	330.8	330.9	330.6	330.7	0.5422	10.9
Final BW, kg	382.5^b	388.2^a	382.8^b	391.2^a	379.6^b	0.0050	11.0
DMI, kg/d	7.73^b	8.26^a	7.73^b	8.41^a	7.63^b	0.0160	0.31
ADG, kg/d	1.352^b	1.549^a	1.354^b	1.667^a	1.251^b	0.0050	0.080
FE, G:F	0.177^bc	0.190^ab	0.177^bc	0.199^a	0.166^c	0.0440	0.010