Urinary Creatinine as an Index of Urinary Excretion of Estrogen in Cows Prepartum and Postpartum

Erb, R.E.; Surve, A. H.; Randel, R.D.; Garverick, H.A.

doi:10.3168/jds.s0022-0302(77)83988-x

Cited by 17 publications

(16 citation statements)

References 11 publications

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“…These results differ from those reporled for sheep (Hodgen et a\. 1961) where more creatinine was excreted from 2400 to 0600 h than from 0600 to 1200 h' There were differences (P < 0.01) in UC excretion between sows, similar to those reported in cows bY Erb et al (1911 ce'i= u9Ad Baldwin and Stabendfelt 1975). Glucocorticoids greatly enhance protein catabolism in muscle (Guyton 1976).…”

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confidence: 56%

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Effect of Parturition on Sow Urinary Creatinine

Bate¹,

Hacker²

1981

Can. J. Anim. Sci.

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On a me sur6 trois fbis par j our sur I 3 tru ies Yorkshire , cntre le -5" j our avant la mise bas et le 4" jour aprDs. la concentration totale en crdatinine de l'urine (U.C.). La quantitd de cr6atinine est rest6e inchang6e durant les trois prcmiers jours puis a diminud dans les deux jours pr6cidant la mise bas. Aprds la mise bas. les valeurs ont augmcnt6 (P < 0,0001) pour atteindre un pic au 2"jour, revenant ensuite graduellement uu niveau prd-natal. Il ne s'est pas produit de diff6rence entrc lcs trois pdriodes iournalibres de collecte, mais de larges diff6renccs (P ( 0,01) se sont manif'estdcs d'un animal d 1'autre.Les corrdlations observ6cs entre le poids de la port6e ct l'6volution du taux d'excrdtion dc cr6atinine (CUCE) dans les l"'et 2" lours aprds la mise bas 6taient respcctivement de 0,746 etO,749 (.P < 0,01). alors que pour les jours 3 ct 4, les valeurs n'6taient plus que de 0,349 ct 0,463 (P < 0,05). On a dlabor6 des 6quations dc prddiction du CUCE d partir du poids de la portde. ll semble quc si l'excrdtion de cr6atinine doit 6trc utilis6e comme indice des conccntrations des m6tabolites urinaires dans les deux premiers jours qui suivcnt la mise bas, il faudra tenir colnptc des changements affcctant l'excr6tion.

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confidence: 56%

“…However, Patof urinary metabolites in different species erson (1967) suggested that creatinine is not Erb et al 1911 When the values of UC excretion were expressed as mg UC'kg' 'day'r. the same trend was maintained, but the pre-and postpartum differences became even larger.…”

mentioning

confidence: 99%

Effect of Parturition on Sow Urinary Creatinine

Bate¹,

Hacker²

1981

Can. J. Anim. Sci.

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“…Since urinary creatinine excretion has been considered as an internal marker of urinary output (De Groot and Aafjes, 1960;Erb et al, 1977), Antoniewicz et al (1981) suggested that the molar ratio of PDs to creatinine (PD/c) in spot urine samples could be used to overcome these restrictions. Use of this approach is valid provided that renal clearances of PDs approach that of creati- nine, diurnal variations in spot sample PD/c ratios are small or at least consistent and PD/c ratios are closely correlated with daily PD excretion (Chen et al, 1995).…”

Section: Applicationmentioning

confidence: 99%

Estimation of microbial protein supply in ruminant animals based on renal and mammary purine metabolite excretion. A review

Shingfield¹

2000

J. Anim. Feed Sci.

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The potential of mammary and renal purine metabolite excretion as a technique for the assessment of microbial protein supply in ruminant animals is reviewed. Data reported in the literature tends to support the validity of the assumptions of the technique that purines entering the duodenum are essentially microbial in origin and that following metabolism, purine catabolites (collectively allantoin, hypoxanthine, uric acid and xanthine) are quantitatively recovered in urine. The most convincing experimental evidence suggests that secretion of purine metabolites in milk is of little value for the assessment of microbial protein supply due a mumal correlation with milk yield. In contrast, use of urinary purine metabolite excretion does appear to provide estimates of microbial protein supply that, are in general, consistent with values derived using standard in vivo procedures. However, the accuracy of this approach is largely dependent on obtaining representative samples of rumen microbes and the ability to account for variations in non-renal excretion and endogenous purine losses. In conclusion, urinary purine metabolite excretion appears to represent a valid noninvasive procedure to assess relative differences, rather than quantitative estimates of microbial protein supply in ruminant animals.

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“…To translate urinary Ca excretion values expressed as a fraction of creatinine excretion into daily Ca excretion, it is necessary to assume a constant daily creatinine excretion for the dry cow. In this model, daily creatinine excretion is considered to be 17·5 g/d based on estimates from literature references (125,126) . In this mechanistic analysis, urinary Ca excretion is estimated as a function of the DCAD with an adapted version of the equation from Roche et al (49) .…”

Section: Estimation Of Blood Calcium Clearancementioning

confidence: 99%

A novel model to explain dietary factors affecting hypocalcaemia in dairy cattle

Martín-Tereso

Verstegen

2011

Nutr. Res. Rev.

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Most dairy cows exhibit different degrees of hypocalcaemia around calving because the gestational Ca requirements shift to the disproportionately high Ca requirements of lactation. Ca homeostasis is a robust system that effectively adapts to changes in Ca demand or supply. However, these adaptations often are not rapid enough to avoid hypocalcaemia. A delay in the reconfiguration of intestinal Ca absorption and bone resorption is probably the underlying cause of this transient hypocalcaemia. Several dietary factors that affect different aspects of Ca metabolism are known to reduce the incidence of milk fever. The present review describes the interactions between nutrition and Ca homeostasis using observations from cattle and extrapolations from other species and aims to quantitatively model the effects of the nutritional approaches that are used to induce dry cows into an early adaptation of Ca metabolism. The present model suggests that reducing dietary cation -anion difference (DCAD) increases Ca clearance from the blood by dietary induction of systemic acidosis, which results in hypercalciuria due to the loss of function of the renal Ca transient receptor potential vanilloid channel TRPV5. Alternatively, reducing the gastrointestinal availability of Ca by reducing dietary Ca or its nutritional availability will also induce the activation of Ca metabolism to compensate for basal blood Ca clearance. Our model of gastrointestinal Ca availability as well as blood Ca clearance in the transition dairy cow allowed us to conclude that the most common dietary strategies for milk fever prevention may have analogous modes of action that are based on the principle of metabolic adaptation before calving.

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Urinary Creatinine as an Index of Urinary Excretion of Estrogen in Cows Prepartum and Postpartum

Cited by 17 publications

References 11 publications

Effect of Parturition on Sow Urinary Creatinine

Effect of Parturition on Sow Urinary Creatinine

Estimation of microbial protein supply in ruminant animals based on renal and mammary purine metabolite excretion. A review

A novel model to explain dietary factors affecting hypocalcaemia in dairy cattle

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