Interrelationships of nutrition, metabolic hormones and resumption of ovulation in multiparous suckled beef cows on subtropical pastures

Samadi, F.; Phillips, Nancy J.; Blache, Dominique; Martin, Graeme B.; D’Occhio, Michael J.

doi:10.1016/j.anireprosci.2012.12.012

Cited by 41 publications

(32 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Nutrient availability has been reported to be a major determinant of the postpartum anoestrous period in cattle that graze subtropical pastures. This influences the length of the period to resumption of ovulation after calving in beef and dairy cattle , Diskin et al, 2003, Samadi et al, 2013. Early cycling and late cycling cows recorded a higher BCS than non-cycling cows.…”

Section: Discussionmentioning

confidence: 99%

Blood metabolite concentrations and postpartum resumption of ovarian cyclicity in Sanga cows

Damptey¹,

Obese²,

Aboagye³

et al. 2014

SA J. An. Sci.

View full text Add to dashboard Cite

An experiment was conducted to investigate the effect of concentrations of certain blood nutrientsensitive metabolites and the resumption of postpartum ovarian cyclicity in 16 Sanga cows (mean BCS 5). Blood samples were taken from cows from weeks 1 to 13 (90 days) postpartum, processed and the plasma progesterone concentration measured to determine the resumption of postpartum ovarian cyclicity. The cows were classified as having resumed ovarian cyclicity when a plasma progesterone concentration of ≥1.0 ng/mL was recorded for two consecutive weekly samples. Based on the resumption of ovarian activity, cows were classified as early cycling, late cycling or non-cycling. The plasma glucose, cholesterol, total protein, albumin and globulin concentrations recorded were similar in the early cycling, late cycling and non-cycling cows. The mean blood glucose, cholesterol, total protein, albumin and globulin concentrations were 3.60 mmol/L, 2.47 mmol/L, 83.1 g/L, 29.9 g/L and 52.9 g/L, respectively. Plasma urea concentrations in late (6.57 ± 0.17 mmol/L) and non-cycling (6.59 ± 0.17 mmol/L) cows were higher than in the early cycling (5.99 ± 0.17 mmol/L) cows in weeks 1 to 13 postpartum. In addition, the plasma creatinine concentration in the early cycling cows was higher than in late cycling cows (101.8 ± 1.82 versus 94.0 ± 1.99 mmol/L). Cows with higher plasma concentrations of urea and lower creatinine concentrations were at risk of delayed resumption of postpartum ovarian cyclicity. Results suggest poor nutritional status, especially energy deficiency, as a major underlying factor suppressing the postpartum resumption of ovarian cyclicity.

show abstract

Section: Discussionmentioning

confidence: 99%

Blood metabolite concentrations and postpartum resumption of ovarian cyclicity in Sanga cows

Damptey¹,

Obese²,

Aboagye³

et al. 2014

SA J. An. Sci.

View full text Add to dashboard Cite

show abstract

“…However, it further validates the known impact nutrition has on the efficiency with which cows achieve pregnancy after calving (Samadi et al 2013) and its association with foetal/calf losses between confirmed pregnancy and weaning are consistent with previous findings relating to milk yield (Roche et al 2009). …”

Section: Assessment Of Nutritional Effectssupporting

confidence: 89%

“…Similarly, studies demonstrating postpartum cows grazing pastures of approximately 3 units higher for DMD and CP demonstrated early resumption of ovulation (Samadi et al 2013).…”

Section: Dietary Qualitymentioning

confidence: 92%

“…Consequently, the nutrients they provide are generally inadequate to meet maintenance requirement, causing loss of body condition and liveweight, and ultimately affecting reproductive performance. Numerous studies assessing the effects of dietary quality on reproductive performance have been completed (Samadi et al 2013), however, no studies were identified that applied statistical adjustment for body condition score, so that the effects of pasture quality and quantity could be estimated independently of body condition score.…”

Section: Dietary Qualitymentioning

confidence: 99%

See 1 more Smart Citation

Risk factors affecting the reproductive outcome of beef breeding herds in North Australia

McCosker¹

View full text Add to dashboard Cite

Approximately half of Australia's beef breeding herds are located in northern Australia with reproductive performance being identified as having a significant impact on the profitability of these businesses. Although many of the risk factors affecting the reproductive performance of beef cattle have been previously identified, the relative contribution of major risk factors to key measures of performance, after partitioning the effects of other confounding variables, is lacking, particularly for extensive tropical rangeland systems typical of northern Australia.The overall objective of the research described in this thesis was to, i) describe the reproductive performance of commercial beef breeding cattle in northern Australia and, ii) determine, and quantify the effect of the major risk factors associated with three key measures of reproductive performance (lactating cows becoming pregnant within 4 months of calving, cows failing to become pregnant within an approximate 12 month reproductive cycle, and foetal/calf loss between confirmed pregnancy and weaning). It was hypothesised that the major risk factors determining the probability of lactating cows becoming pregnant within four months of calving are similar to those determining the probability of foetal/calf loss between confirmed pregnancy and weaning. To address these objectives, a prospective population-based epidemiological study was conducted between 2007 and 2011 involving 78 commercial beef properties located across northern Australia.Attainable and typical levels of reproductive performance for cow-age cohorts were described using a dataset containing 114,154 annual production cycles of performance data that represented approximately 78,000 heifers and cows managed in 142 breeding groups. Properties were assigned to one of four broad country types following a subjective assessment of the production potential of the grazing land and cross-referencing with pasture and vegetation descriptions reported by the herd owners/managers.The typical overall reproductive performance of cows in the Northern Forest (57 live calves at muster per 100 surviving mature cows), was considerably lower than that for the other country types (71-83 live calves at muster per 100 surviving mature cows). This was due to typically much lower percentage of cows becoming pregnant within 4 months of calving, higher foetal and calf loss and higher estimated mortality of pregnant cows in the Northern Forest compared to the other genotypes. These findings are consistent with the generally poorer quantity and quality of pasture, ii harsher environment and higher disease risk of cattle managed in the Northern Forest compared to the other country types.Country type and predicted calving period were top-order determinants of pregnancy within 4 months of calving while lactating. The effect of cow-age class cohort was dependent on country type with the expected occurrence of lactating cows pregnant within 4 months of calving estimated to be 23. 1-53.8, 38.1-61.6, 35.4-56.5 and 38.5...

show abstract

“…Similarly, in the present experiment using beef cows that were in a better BCS, β-AA treatment also reduced the reproductive response to an oestrus induction treatment and, as before, serum concentrations of IGF-I were 25% lower than in control cows. Several investigations have reported that the reduction in serum concentrations of IGF-1 negatively affects reproductive function (Samadi et al, 2013). For example, in beef cows and heifers undergoing nutritional restriction, there is a reduction in serum concentrations of IGF-I and LH (Bossis et al, 2000) that delayed the first ovulation after re-feeding (Bossis et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Increased body condition score through increased lean muscle, but not fat deposition, is associated with reduced reproductive response to oestrus induction in beef cows

Guzmán

González-Padilla

Garces-Yepez

et al. 2016

Animal

View full text Add to dashboard Cite

Energy reserve, estimated as body condition score (BCS), is the major determinant of the re-initiation of ovarian activity in postpartum cows. Leptin, IGF-I and insulin are positively related to BCS and are putative mediators between BCS and reproductive function. However, when BCS and body composition dissociates, concentrations of these metabolic hormones are altered. We hypothesized that increasing lean muscle tissue, but not fat tissue, would diminish the reproductive response to oestrus induction treatments. Thirty lactating beef cows with BCS of 3.10 ± 1.21 and 75.94 ± 12 days postpartum were divided in two groups. Control cows (n = 15) were supplemented with 10.20 kg of concentrate daily for 60 days. Treated cows (n = 15) were supplemented equally, and received a β-adrenergic receptor agonist (β-AA; 0.15 mg/kg BW) to achieve accretion of lean tissue mass and not fat tissue mass. Twelve days after ending concentrate supplementation/β-AA treatment, cows received a progestin implant to induce oestrus. Cows displaying oestrus were inseminated during the following 60 days, and maintained with a fertile bull for a further 21 days. Cows in both groups gained weight during the supplementation period (Daily weight gain: Control = 0.75 kg v. β-AA = 0.89 kg). Cows treated with β-AA had a larger increase in BCS (i.e. change in BCS: control = 1 point (score 4.13) v. β-AA = 2 points (score 5.06; P < 0.05), as a result of muscle accretion (i.e. change in muscle depth: control 0.21 cm v. β-AA 0.97 cm; P < 0.05) but not adipose tissue (i.e. change in back fat depth; control 0.13 cm v. β-AA −0.06 cm; P < 0.05). The changes in body composition in β-AA cows were associated with a reduction in serum concentrations of IGF-I (25.4%) and leptin (27.9%), without observed changes in insulin. Ovulation and pregnancy to 1st service (P > 0.05) did not differ between groups. However, the number of cows displaying oestrus (control 13/15 v. β-AA 8/15; P < 0.05) and the percentage cycling (control 6/8 v. β-AA 3/10; P = 0.07) after progestin treatment and the pregnancy percentage at the end of the breeding period (control 13/15 v. β-AA 8/15; P < 0.05) were lower in β-AA than control cows. In summary, the increase BCS through muscle tissue accretion, but not through fat tissue accretion, resulted in a lower response to oestrus induction, lower percentage of cycling animals and lower pregnancy percentage after progestin treatment; which was associated with a decrease in serum concentrations of leptin and IGF-I.Keywords: β-AA, energy status, IGF-I, insulin, leptin ImplicationsReproductive function in postpartum beef cows is regulated by energy status and positively associated with serum concentrations of leptin, insulin and IGF-I. β-adrenergic receptor agonist (β-AA) treatment results in muscle accretion, whilst reducing fat deposition. The reduction in body fat, despite the overall BW gain, results in lower leptin and IGF-I concentrations and a suboptimal response to an oestrus induction programme and pregnancy percentage after breeding. He...

show abstract

Interrelationships of nutrition, metabolic hormones and resumption of ovulation in multiparous suckled beef cows on subtropical pastures

Cited by 41 publications

References 34 publications

Blood metabolite concentrations and postpartum resumption of ovarian cyclicity in Sanga cows

Blood metabolite concentrations and postpartum resumption of ovarian cyclicity in Sanga cows

Risk factors affecting the reproductive outcome of beef breeding herds in North Australia

Increased body condition score through increased lean muscle, but not fat deposition, is associated with reduced reproductive response to oestrus induction in beef cows

Contact Info

Product

Resources

About