Plasma progesterone concentrations as puberty criteria for Brahman-crossbred heifers

Cooke, Reinaldo F; Arthington, J. D.

doi:10.1016/j.livsci.2008.10.009

Cited by 26 publications

(12 citation statements)

References 19 publications

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“…Moreover, blood samples were collected from the coccygeal vein or artery in plain tubes for progesterone quantification to confirm pubertal status. Puberty onset was defined when a corpus luteum was detected by ultrasonography and Ferraz, Pires, Santos, Silva, Oliveira, Polizel, Biehl, Sartori and Nogueira confirmed by serum progesterone concentration higher than 1.5 ng/ml (Cooke and Arthington, 2009).…”

Section: Methodsmentioning

confidence: 99%

A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months

Ferraz

Pires

Santos

et al. 2018

Animal

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Nelore heifers usually begin their reproductive life at ⩾24 months of age mainly due to suboptimal nutritional conditions and genetics. This study aimed to determine the effect of expected progeny difference (EPD) for age at first calving and average daily gain (ADG) on puberty in Nelore (Bos taurus indicus) heifers. A total of 58 weaned heifers (initial BW=174±6 kg; age=9±1 months) were allocated into 28 feedlot pens. Heifers were born from four sires, of which two had low EPD for age at first calving (L; n=33) and two had high EPD for age at first calving (H; n=25). Then, heifers of each EPD were randomly assigned to high ADG (HG; 0.7 kg) or low ADG (LG; 0.3 kg), resulting in four treatments: heifers from L sires were submitted to either HG (LHG; n=17) or LG (LLG; n=16), and heifers from H sires were submitted to either HG (HHG; n=12), or LG (HLG; n=13). The HG heifers were fed a 75% grain diet, whereas the LG heifers received 93% of forage in their diet. Blood samples were collected at 9, 14, 18, 24 and 28 months of age for IGF1 and leptin determination. There was a treatment effect (P<0.01) on the proportion of heifers that attained puberty by 18 (62%, 0%, 0% and 0%), 24 (100%, 6%, 54% and 0%) or 36 (100%, 100%, 100% and 38%) months of age for LHG, LLG, HHG and HLG treatments, respectively. In addition, mean age at puberty was different across treatments (P<0.01). Heifers from the LHG achieved puberty at the earliest age when compared with cohorts from other treatments (18.1, 28.9, 23.9 and 34.5 months for LHG, LLG, HHG and HLG, respectively). Serum IGF1 concentrations were higher for L heifers compared with H cohorts at 9, 14, 18, 24 and 28 months of age (P<0.01; treatment×age interaction), whereas circulating leptin concentrations were higher (P<0.01; age effect) as heifers became older, regardless of the treatments. In conclusion, only Nelore heifers with favorable genetic merit for age at first calving were able to attain puberty by 18 months of age. In heifers with unfavorable genetic merit for age at first calving, supplementary feeding to achieve high ADG was unable to shift the age at puberty below 24 months.

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Section: Methodsmentioning

confidence: 99%

A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months

Ferraz

Pires

Santos

et al. 2018

Animal

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“…Only samples from ovulated cows were used in the subsequent analysis (n = 43). Luteolysis was determined when serum progesterone concentrations from samples collected after the PGF2,, treatment were <1.5 ng/mL (Cooke and Arthington, 2009). Cows with serum progesterone concentrations >1.5 ng/mL 48 h after PGF^,, treatment were considered as having a functional corpus luteum and not responsive to the PGFj« treatment.…”

Section: Animals Treatments and Samplingmentioning

confidence: 99%

“…Blood samples were collected on d 7, 8, 9, and 10, approximately 3 to 4 h after supplements were offered for determination of serum progesterone concentrations. Luteolysis was determined when serum progesterone concentrations were <1.5 ng/mL (Cooke and Arthington, 2009). Short cycles were determined in ovulated cows that experienced luteolysis before d 10 of the experiment.…”

Section: Animals Treatments and Samplingmentioning

confidence: 99%

Strategic supplementation of calcium salts of polyunsaturated fatty acids to enhance reproductive performance of Bos indicus beef cows

Cooke

Peres

Vasconcelos

2011

Journal of Animal Science

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Five experiments evaluated the effects of supplemental Ca salts of PUFA on reproductive function of Bos indicus beef cows. In Exp. 1, nonlactating and multiparous grazing cows (n = 51) were assigned to receive (as-fed basis) 0.1 kg of a protein-mineral mix + 0.1 kg of ground corn per cow/d, in addition to 0.1 kg per cow/d of 1) Ca salts of PUFA (PF), 2) Ca salts of SFA (SF), or 3) kaolin (control). Treatments were offered from d 0 to 20 of the estrous cycle. No treatment effects were detected on serum progesterone concentrations (P = 0.83), day of luteolysis (P = 0.86), or incidence of short cycles (P = 0.84). In Exp. 2, nonlactating and multiparous grazing cows (n = 43) were assigned to receive PF, SF, or control from d 0 to 8 of the estrous cycle. On d 6, all cows received (intramuscularly) 25 mg of PGF(2α). No treatment effects were detected on serum progesterone concentrations on d 6 (P = 0.37), and incidence (P = 0.67) or estimated time of luteolysis (P = 0.44). In Exp. 3, twenty-seven lactating and multiparous grazing cows, approximately 30 to 40 d postpartum, were assigned to receive PF or control for 10 d beginning at the first postpartum ovulation. No treatment effects were detected (P = 0.85) on incidence of short cycles. In Exp. 4, lactating and multiparous grazing cows (n = 1,454), approximately 40 to 60 d postpartum, were assigned to receive 1 of the 7 treatments for 28 d after timed AI (TAI; d 0): 1) control from d 0 to 28, 2) SF from d 0 to 14 and then control, 3) PF from d 0 to 14 and then control, 4) SF from d 0 to 21 and then control, 5) PF from d 0 to 21 and then control, 6) SF from d 0 to 28, and 7) PF from d 0 to 28. Cows receiving PF for more than 21 d after TAI had greater (P < 0.01) pregnancy to TAI compared with all other treatments combined (50.4 vs. 42.4%, respectively). In Exp. 5, lactating and multiparous grazing cows (n = 501), approximately 40 to 60 d postpartum, were assigned to receive 1 of the 4 treatments for 21 d after TAI (d 0): 1) PF from d 0 to 14 and then control, 2) control from d 0 to 6 and then PF, 3) control from d 0 to 13 and then PF, and 4) PF from d 0 to 21. Cows receiving PF after d 14 of the experiment had greater (P = 0.02) pregnancy to TAI compared with cows not receiving PF during the same period (46.8 vs. 33.1%, respectively). In summary, supplemental Ca salts of PUFA during the expected time of luteolysis increased pregnancy to TAI in beef cows.

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“…The minimum detectable concentration was 0.1 ng/mL and 100 mL of plasma volume was assayed in both years. Date of resumption of cyclicity was defined as the first sampling day when progesterone concentrations were Z1.5 ng/mL (Cooke and Arthington, 2009) for two consecutive sampling dates.…”

Section: Sample Collection and Analysismentioning

confidence: 99%

Evaluation of beef cow and calf separation systems to improve reproductive performance of first-calf cows

et al. 2012

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Plasma progesterone concentrations as puberty criteria for Brahman-crossbred heifers

Cited by 26 publications

References 19 publications

A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months

A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months

Strategic supplementation of calcium salts of polyunsaturated fatty acids to enhance reproductive performance of Bos indicus beef cows

Evaluation of beef cow and calf separation systems to improve reproductive performance of first-calf cows

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