Changes in plasma concentrations of glucose, free fatty acids, ketone bodies, thyroxine and insulin of lactating beef cows in relation to time of feeding and energy status

Coggins, Christopher R. E.; Field, A. C.

doi:10.1017/s0263967x00000069

Cited by 9 publications

(4 citation statements)

References 16 publications

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“…FFA and ketone concentrations were not recorded by these authors. The present FFA values are similar to those reported for lactating beef cows by Coggins & Field (1978) but higher than those in dairy herds studied by Parker & Blowey (1976). Ketone concentrations in the present study fall within the range recorded by Kelly (1977) but are markedly higher than those recorded by Coggins & Field (1978).…”

Section: Discussionsupporting

confidence: 89%

Factors influencing the concentration of minerals and metabolites in the plasma of cattle

Wiener¹,

Russell²,

Field

1980

J. Agric. Sci.

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One hundred and seventy-seven female Ayrshire cattle from approximately 6 months to 6 years of age were sampled on one occasion to determine the concentrations in plasma of Cu, P, Ca, Mg, Na, K and glucose. Eighty-nine adults, either lactating or dry, were re-sampled 2 months later to estimate concentrations of ketone bodies and free fatty acids. The data were analysed to estimate the contributions of various factors to variation in the concentrations.The combination of age and stage of pregnancy or lactation significantly affected variation in all the constituents although some of this variation was accounted for by milk yield. The concentrations of Cu, Mg, glucose and ketones were significantly affected by milk yield. The presence of ketone bodies in milk (recorded in relation to the first occasion of bleeding only) was associated with a significant increase in the plasma concentrations of Na and Mg and a significant decrease of K and Ca.The herd comprised pairs of genetically related animals. However, the estimates of heritability had large standard errors and only those for P and Ca were significantly positive.

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Section: Discussionsupporting

confidence: 89%

Factors influencing the concentration of minerals and metabolites in the plasma of cattle

Wiener¹,

Russell²,

Field

1980

J. Agric. Sci.

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“…Conversely from parturition to 45-d, total T3 and T4 levels behave distinctly. [57] demonstrated that, compared to T3, T4 serum concentrations were a more sensitive indicator of energy balance in lactating beef cows. This supports our observation of lower T4 levels on post-partum day 15, unlike T3, which did not vary much during the post-partum.…”

Section: Discussionmentioning

confidence: 98%

Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase

Ferreira

Rennó

Detmann

et al. 2020

Preprint

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Background: Supplementation programs for prepartum beef cows are usually adopted because the nutritional status of the cows upon calving is a main factor impacting reproductive performance of the next production cycle. This study evaluated the effects of 60-d pre-partum energy-protein supplementation on performance, metabolic and hormonal responses during the peripartum phase of grazing beef cows. Thirty-eight pregnant multiparous Nellore cows were assigned to a completely randomized design with two treatments: control (no supplement) and supplementation (1.5 kg of energy-protein per d with 30% crude protein, dry matter basis) Results: The supplemented cows had higher ADG pre-partum (P<0.10), but postpartum ADG did not differ between treatments. Supplementation did not affect BCS and calf BW upon calving, on days 45 and 90, milk yield and composition (P>0.10). No differences were found for forage intake and neutral detergent fiber digestibility (P>0.10). The intake and digestibility of CP and OM increased in response to supplementation (P<0.10). An interaction occurred between supplementation and peripartum days for BUN, βHB, T3 and T4, which had higher concentrations for supplemented cows at pre-partum period (P<0.10). Concentration of others blood parameters significantly changed along peripartum days (P<0.10). There was no difference in pregnancy rates and days from calving to conception between treatments (P>0.10). Conclusions: Providing an energy and protein supplement to grazing Nellore cows over the last 60 d of gestation improved their pre-partum energy balance. However, no post-partum carryover effects were detected. Keywords: nutrition, metabolism, parturition, Zebu

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“…Conversely from parturition to 45-d, total T3 and T4 levels behave distinctly. Coggins and Field [42] demonstrated that, compared to T3, T4 serum concentrations were a more sensitive indicator of energy balance in lactating beef cows. This supports our observation of lower T4 levels on post-partum day 15, unlike T3, which did not vary much during the post-partum.…”

Section: Discussionmentioning

confidence: 99%

Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase

et al. 2020

View full text Add to dashboard Cite

Background: Supplementation programs for prepartum beef cows are usually adopted because the nutritional status of the cows upon calving is a main factor impacting reproductive performance of the next production cycle. This study evaluated the effects of 60-d pre-partum energy-protein supplementation on performance, metabolic and hormonal responses during the peripartum phase of grazing beef cows. Thirty-eight pregnant multiparous Nellore cows were assigned to a completely randomized design with two treatments: control (no supplement) and supplementation (1.5 kg of energy-protein per d with 30% crude protein, dry matter basis). Results: The supplemented cows had higher ADG pre-partum (P < 0.10), but postpartum ADG did not differ between treatments. Supplementation did not affect BCS and calf BW upon calving, on days 45 and 90, milk yield and composition (P > 0.10). No differences were found for forage intake and neutral detergent fiber digestibility (P > 0.10). The intake and digestibility of CP and OM increased in response to supplementation (P < 0.10). An interaction occurred between supplementation and peripartum days for BUN, βHB, T3 and T4, which had higher concentrations for supplemented cows at pre-partum period (P < 0.10). Concentration of others blood parameters significantly changed along peripartum days (P < 0.10). There was no difference in pregnancy rates and days from calving to conception between treatments (P > 0.10). Conclusions: Providing an energy and protein supplement to grazing Nellore cows over the last 60 d of gestation improved their pre-partum energy balance. However, no post-partum carryover effects were detected.

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Changes in plasma concentrations of glucose, free fatty acids, ketone bodies, thyroxine and insulin of lactating beef cows in relation to time of feeding and energy status

Cited by 9 publications

References 16 publications

Factors influencing the concentration of minerals and metabolites in the plasma of cattle

Factors influencing the concentration of minerals and metabolites in the plasma of cattle

Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase

Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase

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