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Feeding microbially-enhanced soy protein in starter pellets to dairy calves
Feeding microbially-enhanced soy protein in starter pellets to dairy calves
Tuesday, March 15, 2016: 2:00 PM
308-309 (Community Choice Credit Union Convention Center)
Abstract Text: Our objective was to determine effects of feeding calves starter pellets with microbially-enhanced (fungi-treated) soy protein (MSP) compared to soybean meal (SBM) with different milk replacers (MR). Thirty-six Holstein calves (2 d old; 24 females, 12 males) in individual hutches were used in a 12-wk randomized complete block design study. Treatments were: 1) MSP pellets with accelerated growth MR (28% CP, 18% fat; MSPA), 2) SBM pellets with accelerated growth MR (SBMA), and 3) MSP pellets with traditional MR (20% CP, 20% fat; MSPT). Pellets were similar except for 23% MSP or 23% SBM (DM basis). Week 1 0.37 kg and wk 2 to 5 0.45 kg of MR was fed 2×/d, and 1×/d 0.45 kg was fed during wk 6. Pellets and water were fed ad libitum. Intakes were recorded daily. Body weights (BW) and jugular blood samples were collected 2 d every 2 wk at 3 h after the morning feeding. Fecal grab samples were collected 5×/d for 3 d during wk 12 for analysis of total tract digestibility (TTD) of nutrients. Results were analyzed using MIXED procedures with repeated measures and Tukey’s test in SAS 9.4. Significant differences were declared at P<0.05. Total and pellet DMI were greatest for SBMA and least for MSPT. Body weights were greatest for MSPA. Less ADG was found for MSPT versus MSPA. Gain: feed was least for SBMA. Serum glucose was similar among treatments. Plasma urea nitrogen (PUN) was greatest for MSPA and least for MSPT. Beta hydroxyl butyric acid (BHBA) and IGF-1 were greatest for SBMA. Plasma triglycerides were greatest for MSPT. Treatments had similar DM TTD, but MSPT had greater CP TTD versus SBMA. Results demonstrated calves fed MSP had improved gain: feed and improved or maintained growth performance depending on MR.
Item |
Treatment |
|
||
|
MSPA |
SBMA |
MSPT |
SEM |
Total DMI, g/d |
1,650b |
1,759a |
1,388c |
39.6 |
Pellet DMI, g/d |
1,272b |
1,380a |
1,010c |
40.8 |
BW, kg |
72.6a |
68.5b |
67.8b |
3.99 |
ADG, kg/d |
0.68a |
0.63ab |
0.59b |
0.04 |
Gain: Feed |
0.46a |
0.41b |
0.47a |
0.02 |
Glucose, mg/dl |
98.8 |
101.4 |
99.9 |
1.76 |
BHBA, mg/dl |
34.5ab |
35.6a |
31.8b |
1.27 |
Triglyceride, mg/dl |
25.2b |
27.7ab |
28.8a |
1.09 |
PUN, mg/dl |
15.6a |
14.2b |
12.8c |
0.35 |
IGF-1, ng/ml |
63.8b |
73.3a |
60.8b |
3.04 |
DM TTD, % |
81.0 |
80.3 |
84.8 |
1.58 |
CP TTD, % |
86.4ab |
85.1b |
89.7a |
1.37 |
abc Means with unlike superscripts differ by P<0.05.
Keywords: microbially-enhanced soy protein, dairy calf, growth performance