Influence of protein levels and naloxone on ruminal fermentation, serum hormones and metabolites in lambs fed oat hay or barley straw

Cheema, A.U.; Galyean, M. L.; Caton, J. S.; Freeman, A.S.

doi:10.1016/0921-4488(91)90029-p

Cited by 16 publications

(14 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Plasma GH concentration was greater (P ≤ .03) in control cows than in supplemented cows during a majority of the experiment (except mo 7 of gestation; Table 3). Similar responses to protein supplementation have been reported in some cases (Krysl et al, 1987;Caton et al, 1988;Cheema et al, 1991;Barton et al, 1992), but not in others (Branine et al, 1985;Bachman et al, 1989;Caton et al, 1994). During the 3rd mo of lactation, cows fed the low UIP supplement had higher (P = .01) plasma GH than did medium or high UIP-supplemented cows.…”

Section: Resultssupporting

confidence: 77%

“…Apparently, PUN concentration in beef cows is proportional to N intake. The concomitant increase in UIP and PUN in our study likely resulted from induction of deaminase activity by excess dietary UIP (Cheema et al, 1991;Barton et al, 1992;Rusche et al, 1993). Plasma urea N increased quadratically (P = .01) in all treatments to advancing gestation.…”

Section: Resultsmentioning

confidence: 54%

“…Perhaps increasing the level of UIP supplement increases circulating insulin levels during gestation in forage-fed beef cows. Protein supplementation is typically associated with elevated serum insulin (Krysl et al, 1987;Caton et al, 1988Caton et al, , 1994Cheema et al, 1991). However, the significance of increased blood insulin in ruminants is unclear.…”

Section: Resultsmentioning

confidence: 99%

“…however, the protein sparing effects of insulin are not well characterized (Martin, 1985). Protein supplementation increases insulin concentrations (Krysl et al, 1987;Caton et al, 1988;Cheema et al, 1991), but insulin concentrations are not always increased by protein supplementation and the level of undegradable intake protein (UIP) in the supplement may influence the response (Caton et al, 1994;Swanson et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Rusche et al (1993) observed similar effects of DIP and UIP supplements on plasma NEFA concentration in beef cows. Moreover, others reported that NEFA were higher in unsupplemented controls than in cottonseed meal-supplemented cattle or sheep (Krysl et al, 1987;Cheema et al, 1991;Barton et al, 1992). Little information is available on plasma hormone and metabolite concentrations in gestating and lactating beef cows in response to increasing level of UIP supplementation, while simultaneously meeting the ruminal DIP requirement.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Undegraded intake protein supplementation: II. Effects on plasma hormone and metabolite concentrations in periparturient beef cows fed low-quality hay during gestation and lactation.

Sletmoen-Olson

Caton

Olson

et al. 2000

Journal of Animal Science

View full text Add to dashboard Cite

Hereford x Angus cows (n = 36; initial wt 568+/-59 kg) were used to evaluate the effects of undegradable intake protein (UIP) supplementation on plasma hormone and metabolite concentrations. Treatments were control (unsupplemented) or one of three protein supplements. Supplements were fed at 1.3 kg DM/d and included UIP at low, medium, or high levels (53, 223, or 412 g UIP/kg supplement DM, respectively). Supplements were formulated to be isocaloric (1.77 Mcal NEm/kg) and to contain equal amounts of degradable intake protein (DIP; 211 g DIP/kg supplement DM). Prairie hay (5.8% CP) was offered for ad libitum consumption. Jugular blood samples were collected daily from each cow during six 7-d collection periods (corresponding to mo 7, 8, and 9 of gestation and to mo 1, 2, and 3 of lactation). Plasma glucose concentrations were similar between control and supplemented cows during mo 2 and 3 of lactation; however, the low UIP treatment group had consistently higher plasma glucose (P< or =.02) than cows fed medium or high UIP supplements during gestation and the last month of lactation. During gestation, cows fed the high UIP supplement had higher (P< or =.08) plasma glucose than cows fed the medium UIP supplement. During gestation, plasma insulin concentration was increased (P = .01) by supplementation; insulin also increased (P<.01; mo 8 and 9) as supplemental UIP increased. During lactation, plasma insulin was greater (P = .01) in supplemented than in control cows. During mo 2 and 3 of lactation, insulin was lower (P< or =.04) in cows fed low UIP supplement compared with cows fed medium or high UIP supplements. Growth hormone concentration was higher (P< or =.03) in control cows than in supplemented cows in all periods measured except mo 7 of gestation. Plasma nonesterified fatty acid concentrations were higher (P< or =.03) in control cows than in supplemented cows in all periods measured except the 1st mo of lactation. These data are interpreted to suggest that protein supplementation and level of UIP can alter plasma concentrations of hormones and metabolites in gestating and lactating beef cows consuming low-quality hay.

show abstract

Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 54%