TY - JOUR
T1 - Slow-release urea partially replacing soybean in the diet of Holstein dairy cows: intake, blood parameters, nutrients digestibility, energy utilization, and milk production
T2 - Intake, blood parameters, nutrients digestibility, energy utilization, and milk production
AU - El-Zaiat, Hani M.
AU - Kholif, Ahmed E.
AU - Khattab, Ibrahim M.
AU - Sallam, Sobhy M.A.
N1 - Publisher Copyright:
© 2021 Hani M. El-Zaiat et al.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - The present experiment aimed to evaluate the partial replacement of soybean with slow-release urea (Optigen 1200™) in the diet of lactating cows for 84 d. Three-hundred multiparous lactating Holstein (635 ± 25 kg of body weight, BW) cows were stratified by live body weight; parity and previous milk production were randomly assigned into two experimental groups with 150 cows per each treatment. In the control treatment, 25 g soybean meal was replaced by 5.7 g slow-release urea for 84 d. Optigen treatment did not affect feed intake, daily milk production, milk composition, or milk (feed) efficiency; however, increased (P<0.01) total BW gain and daily BW gain. Optigen treatment increased (P<0.01) the digestibility of crude protein and neutral detergent fiber. Optigen treatment increased (P<0.01) estimated N balance, milk urea-N, and net energy (NE) for gain. Without affecting blood total protein, creatinine, urea-N, triglycerides, glucose, β-hydroxybutyrate, or non-esterified free fatty acids, Optigen treatment increased the concentrations of blood albumin and cholesterol compared to the control (P<0.05). In conclusion, slow-release urea could replace soybean meal in ruminant diets with no adverse effects on feed intake, nitrogen utilization, or digestibility; however, improve the total tract digestibility of fiber and crude protein in cows.
AB - The present experiment aimed to evaluate the partial replacement of soybean with slow-release urea (Optigen 1200™) in the diet of lactating cows for 84 d. Three-hundred multiparous lactating Holstein (635 ± 25 kg of body weight, BW) cows were stratified by live body weight; parity and previous milk production were randomly assigned into two experimental groups with 150 cows per each treatment. In the control treatment, 25 g soybean meal was replaced by 5.7 g slow-release urea for 84 d. Optigen treatment did not affect feed intake, daily milk production, milk composition, or milk (feed) efficiency; however, increased (P<0.01) total BW gain and daily BW gain. Optigen treatment increased (P<0.01) the digestibility of crude protein and neutral detergent fiber. Optigen treatment increased (P<0.01) estimated N balance, milk urea-N, and net energy (NE) for gain. Without affecting blood total protein, creatinine, urea-N, triglycerides, glucose, β-hydroxybutyrate, or non-esterified free fatty acids, Optigen treatment increased the concentrations of blood albumin and cholesterol compared to the control (P<0.05). In conclusion, slow-release urea could replace soybean meal in ruminant diets with no adverse effects on feed intake, nitrogen utilization, or digestibility; however, improve the total tract digestibility of fiber and crude protein in cows.
KW - And composition
KW - Milk production
KW - Nitrogen balance
KW - Nitrogen excretion
KW - Nitrogen metabolism
KW - Slow-release urea
KW - slow-release urea
KW - nitrogen metabolism
KW - nitrogen balance
KW - nitrogen excretion
KW - milk production and composition
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UR - https://www.mendeley.com/catalogue/20cfbdd9-c49d-3a71-9bb2-f536c987110b/
U2 - 10.2478/aoas-2021-0053
DO - 10.2478/aoas-2021-0053
M3 - Article
AN - SCOPUS:85115066741
SN - 1642-3402
VL - 22
SP - 723
EP - 730
JO - Annals of Animal Science
JF - Annals of Animal Science
IS - 2
M1 - 0053
ER -