performance of modern high- yielding dairy cows S. Jorjong, G. - - PowerPoint PPT Presentation

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Jan 17, 2024 178 likes •373 views

Association between milk fatty acids in early lactation and subsequent reproductive performance of modern high- yielding dairy cows S. Jorjong, G. Opsomer, J. Chen, A. T. M. van Knegsel, B. Kemp Speaker: Veerle Fievez Association between

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Association between milk fatty acids in early lactation and subsequent reproductive performance of modern high- yielding dairy cows

S. Jorjong, G. Opsomer, J. Chen, A. T. M. van

Knegsel, B. Kemp Speaker: Veerle Fievez

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Veerle Fievez

Ghent University Laboratory for Animal Nutrition and Animal Product Quality

Association between milk fatty acids in early lactation and subsequent reproductive performance of high yielding dairy cows

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Veerle Fievez

Ghent University Laboratory for Animal Nutrition and Animal Product Quality

Association between milk fatty acids in early lactation and subsequent reproductive performance of high yielding dairy cows

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

OUTPUT INPUT

Early lactation: period of NEB

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Baumgard and Rhoads, 2007

Fat mobilization  NEB

Early lactation: period of NEB

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Baumgard and Rhoads, 2007

Fat mobilization  hyperketonemia

Early lactation: risk for hyperketonemia

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

NEB  Reduced fertility

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Baumgard and Rhoads, 2007

NEB & hyperketonemia milk biomarkers

NEB  biomarker in milk

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

NEB  biomarker in milk

biomarker

NEB: plasma NEFA Hyperketonemia

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

NEB  C18:1 cis-9 in milk

Corrected C18:1 cis-9

(g/100 g FA) ≥ 3.98

Corrected C18:1 cis-9

(g/100 g FA) < 3.98

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Hyperketonemia  C18:1 cis-9/C15:0 in milk

C18:1 cis-9/C15:0

(g/g) ≥ 45

C18:1 cis-9/C15:0

(g/g) < 45

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Biomarkers in milk  reproduction

biomarker

Reproductive performance

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Biomarkers in milk  reproduction

biomarker

Resumption of

varian cyclicity?

Calving to pregnancy?

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Biomarkers in milk  reproduction: set up

First 100 days of lactation Experiment 1: 92 cows Experiment 2: 93 cows Blood (weeks 2 to 8): NEFA & BHBA Milk (week 2): fatty acids Milk (week 2 – d100): progesteron

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Biomarkers in milk  reproduction: results

Corr C18:1 cis-9 ≥ 3.98 Corr C18:1 cis-9 < 3.98

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Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

Biomarkers in milk  reproduction: results

C18:1 cis-9/C15:0 ≥ 45 C18:1 cis-9/C15:0 < 45

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Conclusion

Milk fatty acids & reproductive problems 1/ NEB-biomarker:

C18:1cis-9

2/ Hyperketonemia-biomarker

C18:1 cis-9/C15:0

3/ Milk biomarkers of NEB & hyperketonemia:

Delayed first progesteron rise
Prolonged calving - pregnancy

Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be

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Ghent University Laboratory for Animal Nutrition and Animal Product Quality

Member of the Food2Know network – www.food2know.be

Prof. Veerle Fievez

Veerle.Fievez@UGent.be

Thank you for your attention

Laboratory for Animal Nutrition and Animal Product Quality http://www.lanupro.UGent.be – veerle.fievez@ugent.be