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Impacts of feeding intensity and breed on metabolism, negative energy balance and reproductive efficiency in dairy cows

Ntallaris, Theodoros (2018). Impacts of feeding intensity and breed on metabolism, negative energy balance and reproductive efficiency in dairy cows. Diss. (sammanfattning/summary) Uppsala, Sweden : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2018:17
ISBN 978-91-7760-174-6
eISBN 978-91-7760-175-3
[Doctoral thesis]

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Abstract

Despite improved breeding, management, and nutritional strategies, decreased fertility in dairy cows is still widespread. Several studies have highlighted the unfavourable correlation between negative energy balance (NEB) and reproductive performance. However, there is a continuing need for more information regarding the effects of the interaction between different nutritional strategies with animals of different genetic background.

This thesis evaluated the effect of high energy-diet (HE) and low energy-diet (LE) on Holstein and SRB dairy cows. The HE represents what is, in general, common practice among most high milk producing herds. The lower feeding intensity may be representative of e.g. organic dairy producing systems.

In three studies, the metabolic status, milk yield, body condition score (BCS), and NEB were evaluated in cows fed either a HE or a LE diet.
Associations between NEB, plasma adipokines, metabolism, and reproductive parameters were also investigated.

Holstein cows had lower body condition score (BCS) than SRB cows within each energy-diet group. However, diet had no effect on BCS or subcutaneous adipose tissue thickness in Holstein cows irrespective of whether they received a HE or LE diet. The HE group tended to have a less severe energy deficit than the LE group. Holstein cows tended to be in a more severe energy deficit during the first 45 days after calving than SRB cows. Holstein had a lower nadir in energy balance than the SRB.

In conclusion, our results indicate that nutritional strategies might have a stronger association to endocrine and traditional fertility traits than breed. However, breed had a stronger association to the energy balance variables than nutritional strategies. In addition, SRB cows prioritized energy differently when compared to Holstein cows in such a way that the SRB cows maintained homeostasis better than Holsteins who had a deeper energy deficit than SRB cows.

Authors/Creators:Ntallaris, Theodoros
Title:Impacts of feeding intensity and breed on metabolism, negative energy balance and reproductive efficiency in dairy cows
Alternative abstract:
LanguageAbstract
Swedish

Nedsatt fruktsamhet är ett stort problem i mjölkkobesättningar och leder till stora ekonomiska förluster för lantbrukare. Flera studier har visat att det finns ett ogynnsamt samband mellan negativ energibalans och fertilitet hos mjölkkor. Dock finns det ett behov av mer information kring samspelet mellan olika utfodringsintensiteter och djur med olika genetisk bakgrund.
Denna avhandling utvärderade effekten av hög (HE) och låg (LE) utfodringsintensitet hos mjölkkor av raserna Holstein och SRB. Den höga utfodringsintensiteten motsvarar den normala utfodringsintensiteten som tillämpas i högproducerande mjölkbesättningar. Den längre utfodringsintensiteten uppnåddes genom en lägre kraftfoderandel och en högre grovfoderandel i foderstaten. En lägre utfodringsintensitet tillämpas exempelvis generellt inom ekologisk mjölkproduktion.
I tre olika studier utvärderades metabolisk status, mjölkavkastning, hull (BCS) och NEB hos kor som hade en HE eller en LE utfodringsintensitet. Därutöver studerades möjliga samband mellan NEB, plasma adipokiner, metabolism och fertilitet.
Holstein-kor hade lägre BCS än SRB-kor. Utfodringsintensiteten hade däremot ingen effekt på BCS eller underhudsfettets tjocklek hos Holstein-kor. Energiförlusten efter kalvning tenderade att vara lägre hos HE-gruppen än hos LE-gruppen. Holstein-kor tenderade att ha ett större energiunderskott under de första 45 dagarna efter kalvning än SRB-kor. Holstein hade en djupare vändpunkt i den negativa energibalansen än SRB.
Sammanfattningsvis tyder våra resultat på att utfodringsintensiteten kan ha ett starkare samband med fertiliteten än ras. Dock hade rasen ett starkare samband med olika mått på energibalans efter kalvning än utfodringsintensitet. SRB-korna kunde behålla homeostas bättre än Holstein, som hade en större energibrist efter kalvningen än SRB-kor.

Nyckelord: energibalans, transitionsperioden, progesteron, nötkreatur, fertilitet

Författarens adress: Theodoros Ntallaris, SLU, Institutionen för kliniska vetenskaper, Box 7054, 750 07 Uppsala. E-post: theodoros.ntallaris@slu.se

Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :April 2018
Depositing date:April 2018
Volume:2018:17
Number of Pages:90
Papers/manuscripts:
NumberReferences
1T. Ntallaris*, P. Humblot, R. Båge, Y. Sjunnesson, J. Dupont, B. Berglund (2017). Effect of energy balance profiles on metabolic and reproductive response in Holstein and Swedish Red cows. Theriogenology, volume 90, pages 276–283.
2T. Ntallaris*, P. Humblot, R. Båge, Y. Sjunnesson, B. Berglund. Relationships between energy balance and reproductive performance in primiparous Holstein and Swedish Red dairy cows on two energy diets. (manuscript)
3N. Mellouk, C. Rame, J.L. Touzé, E. Briant, L. Ma, D. Guillaume, D. Lomet, A. Caraty, T. Ntallaris, P. Humblot, J. Dupont* (2017). Involvement of plasma adipokines in metabolic and reproductive parameters in Holstein dairy cows fed with different energy diets? Journal of Dairy Science, volume 100 ( issue 10), pages 8518-8533
Place of Publication:Uppsala, Sweden
Publisher:Department of Clinical Sciences, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-174-6
ISBN for electronic version:978-91-7760-175-3
ISSN:1652-6880
Language:English
Additional Information:Study visit at INRA UMR85 Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, France were supported by by SLU’s grant for international long study stays.
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L01 Animal husbandry
L Animal production > L50 Animal physiology and biochemistry
L Animal production > L53 Animal physiology - Reproduction
Subjects:Obsolete subject words > VETERINARY MEDICINE > Physiology and nutrition
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Clinical Science
Agrovoc terms:dairy cattle, feed intake, energy balance, fertility, nutrien management, animal breeding
Keywords:residual feed intake, transition period, reproductive efficiency, individualised management, fertility, cow, progesterone
URN:NBN:urn:nbn:se:slu:epsilon-e-4830
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4830
ID Code:15391
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Clinical Sciences
Deposited By: DVM Theodoros Ntallaris
Deposited On:05 Apr 2018 05:42
Metadata Last Modified:05 Apr 2018 05:42

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