The Effect of Diffe Rent Levels of Feed Intake on the Urinary Excretion of Purine Derivatives in Chinese Yellow Cattle

Mo, Fuwang; Wang, Y. X.; Xing, Z.; Yang, Yimin; Chen, X. B.

doi:10.1007/978-1-4020-2844-1_12

Cited by 2 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When this was performed, the regression Y PD = 34.4DOM + 0.59 (R 2 = 0.74) was obtained (Figure 2), indicating an excretion (P < 0.001) of 34.4 mmol of PD/kg of DOM ingested. Soejono et al (2004) and Mo et al (2004), working with B. indicus and Bos namadicus crossbred cattle offered diets at 40 to 95% of the voluntary intake level, reported a linear relationship between the urinary PD excretion and DMI (Y PD = 31.2DMI -11.4; R 2 = 0.64) and DOM (Y PD = 21.4DOM + 18.9; R 2 = 0.97), respectively. These relationships are consistent with our findings.…”

Section: Exp Imentioning

confidence: 99%

Endogenous fraction and urinary recovery of purine derivatives obtained by different methods in Nellore cattle1

Barbosa

Valadares

Filho

et al. 2011

Journal of Animal Science

100

View full text Add to dashboard Cite

Two experiments were conducted to assess the endogenous fraction of purine derivative (PD) excretion, urinary recovery, and intestinal digestibility of purines in Nellore heifers. For both experiments, 8 Nellore heifers fitted with ruminal and abomasal cannulas were allocated to two 4 × 4 Latin squares. The diets were based on corn silage and concentrate (60 and 40% DM basis, respectively); feces and urine samples were obtained by total collection, and abomasal DM flow was estimated using indigestible NDF as an internal marker. In Exp. I, 4 of the 8 heifers (BW 258 ± 20 kg) were also fitted with ileal cannula. The planned treatments were 4 different DMI: 1.2, 1.6, 2.0, and 2.4% of BW (DM basis). The endogenous losses and purine recovery as urinary PD were estimated using linear regression between daily urinary PD excretion (Y) and daily abomasal flow of purine bases (X), expressed in millimoles per kilogram of BW(0.75). In Exp. II, the same 8 Nellore heifers (BW of 296 ± 15 kg) were fed at 1.37% BW (DM basis). The treatments were the infusion of purines (RNA from torula yeast, type VI, Sigma) into the abomasum in increasing amounts (0, 33, 66, and 100 mmol/d). All statistical analyses were performed using the PROC MIXED procedure in SAS. In Exp. I, the DMI range was 1.16 to 1.84% of BW and did not affect (P > 0.05) the apparent RNA digestibility in the small intestine, which had a mean of 75.6%, and a true digestibility of 93.0%. The mean ratio of the N-RNA to the total-N in the ruminal bacteria was 0.137. The daily urinary PD excretion (Y, mmol/kg of BW(0.75)) was a function of RNA flow in the abomasum (X, mmol/kg of BW(0.75)): Y = 0.860X + 0.460, where 0.860 and 0.460 were the PD recovery of purines and the endogenous fraction (in mmol/kg of BW(0.75)), respectively. In Exp. II, the daily urinary PD excretion was a function of RNA flow in the abomasum: Y = 0.741X + 0.301, where 0.741 and 0.301 were the recovery of PD in urine of infused purines and the endogenous losses (in mmol/kg of BW(0.75)), respectively. In conclusion, our data suggest that in Nellore heifers the respective values of endogenous PD excretion (mmol/kg of BW(0.75)), urinary recovery of the purines absorbed in the abomasum, and true digestibility of RNA in the small intestine were 0.30, 0.80, and 0.93.

show abstract

Section: Exp Imentioning

confidence: 99%