TY - JOUR
T1 - Effect of Rumen Degradable Protein Supplementation on Purine Derivatives Excreted Through Urine and Milk in Lactating Holstein Cows
AU - Kazemi-Bonchenari, Mehdi AU - Rezayazdi, Kamran AU - Ghasemi, Hossein Ali AU - Farahani, Amir Hossein AU - Dehghan-Banadaky, Mehdi AU - Mahdavi, Ata
JO - Journal of Animal and Veterinary Advances
VL - 10
IS - 18
SP - 2389
EP - 2393
PY - 2011
DA - 2001/08/19
SN - 1680-5593
DO - javaa.2011.2389.2393
UR - https://makhillpublications.co/view-article.php?doi=javaa.2011.2389.2393
KW - milk
KW -lactating cows
KW -urine spot sampling
KW -Purine derivatives
KW -urine
KW -uric acid
AB - This study was conducted to evaluate the effect of Supplemented
Rumen Degradable Protein (SRDP) on excretion of Total Purine Derivatives (TPD;
urinary allantoin, urinary uric acid, milk allantoin and milk uric acid) and
contribution of purine derivatives excreted through urine or milk in TPD. Multiparous
lactating Holstein cows (n = 15) with an average Body Weight (BW) of 643 kg,
days in milk; 21 days and milk yield 30 kg days•1 fed a basal
diet with different levels of SRDP (treatments 1-3 were 0, 50 and 100 g days•1
SRDP, respectively). The TPD excretion was 464.81, 468.70 and 480.83 mmol days•1
for treatments 1-3, respectively (p = 0.009). Urinary allantoin (p = 0.01) and
uric acid (p = 0.04) and milk allantoin (p = 0.02) were affected but milk uric
acid was not affected by SRDP. Although, the amounts of excreted purines affected
with SRDP, the contribution of Urinary Purine Derivatives (UPD) and Milk Purine
Derivatives (MPD) to TPD were approximately constant. Urinary allantoin, urinary
uric acid, milk allantoin and milk uric acid accounted approximately 91.63,
4.54, 3.07 and 0.73% of excreted TPD, respectively. In conclusion, regardless
the effect of SRDP, the results indicate that urinary allantoin accounted the
greatest and milk uric acid accounted the least contribution in TPD excretion
in lactating Holstein cows.
ER -