906
Feed efficiency and carcass traits for Nellore young bulls fed processed soybean grains
Tuesday, July 22, 2014
Exhibit Hall AB (Kansas City Convention Center)
Maria Cecilia L Alves
,
Universidade Federal de Lavras, Lavras, Brazil
Marcio Machado Ladeira
,
Universidade Federal de Lavras, Lavras, Brazil
Daniel R Casagrande
,
Universidade Federal de Lavras, Lavras, Brazil
Jose Rodolfo R Carvalho
,
Universidade Federal de Lavras, Lavras, Brazil
Priscilla D Teixeira
,
Universidade Federal de Lavras, Lavras, Brazil
Leslie A Silveira
,
Universidade Federal de Lavras, Lavras, Brazil
Aline C Rodrigues
,
Universidade Federal de Lavras, Lavras, Brazil
Luana R Santos
,
Universidade Federal de Lavras, Lavras, Brazil
Abstract Text: Use of lipid sources in beef cattle diet is recommended in order to increase diet energy density, and reduce acetate:propionate ratio and methane production, which may benefit ruminal fermentation and improve feed efficiency. The objective of this study was to evaluate the feed efficiency and carcass quality of Nellore young bulls fed ground soybean or extruded soybean. Sixty animals (average body weight of 320.33 ±8.12 kg) were used in a completely randomized design. Corn silage was fed as the forage source along with three different types of concentrates, representing the following treatments: no soybean, ground soybean (GSB) and extruded soybean (ESB). Dietary crude protein averaged 13.9% while soybean diets contained 6.1% ether extract. Animals were allocated to twelve pens based on dietary treatment (4 pens/treatment). Animals were weighed at the beginning, after 26 days of adaptation to experimental diets, and at the end of the feedlot to calculate average daily gain after fasting cattle for 16 hours. After 88 days on feed, cattle were slaughtered using cerebral concussion and exsanguination followed by recording hot carcass weights. After 24 hours of chilling at 1°C, cold carcass weights were recorded, along with measuring subcutaneous fat thickness and
longissimus muscle area between the 12th and 13th ribs. The statistical model included the effects of diet with data analyzed using PROC GLM (SAS 9.3). There were no effects of diet on performance and carcass characteristics (Table 1). The feeding of processed soybeans did not affect feed efficiency and carcass traits for young Nellore bulls.
Funded by Fapemig, CNPq, Capes, and INCT-CA.Table 1. Dry matter intake (DMI), average daily gain (ADG), feed efficiency (G:F), final body weight (FBW), hot carcass weight (HCW), cold carcass weight (CCW), longissimus dorsi muscle area (LMA), longissimus dorsimuscle area per 100 kg of carcass (LMA/100kg), backfat thickness (BF), dressing percentage (DP) for young bulls fed processed soybean.
Item
|
NSB1
|
GSB2
|
ESB3
|
SEM
|
P value
|
DMI (kg/d)
|
10.2
|
9.85
|
9.96
|
0.298
|
0.73
|
ADG (kg/d)
|
1.50
|
1.44
|
1.53
|
0.059
|
0.55
|
G:F
|
0.14
|
0.14
|
0.15
|
0.004
|
0.46
|
FBW (kg)
|
440
|
438
|
451
|
10.029
|
0.56
|
HCW (kg)
|
250
|
249
|
259
|
4.633
|
0.26
|
CCW (kg)
|
246
|
244
|
255
|
4.410
|
0.24
|
LMA (cm2)
|
66.1
|
66.6
|
68.2
|
2.252
|
0.86
|
LMA (cm2/100kg)
|
27.8
|
27.3
|
26.8
|
1.089
|
0.83
|
BF (mm)
|
3.03
|
2.73
|
2.88
|
0.237
|
0.68
|
DP (%)
|
56.0
|
56.1
|
56.8
|
0.347
|
0.25
|
1Diet with no soybean; 2Diet with ground soybean; 3Diet with extruded soybean.
Keywords: extruded, feedlot, lipids, oilseeds
