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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PDF
1MB |
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 | ||||||||
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| Title: | Impacts of feeding intensity and breed on metabolism, negative energy balance and reproductive efficiency in dairy cows | ||||||||
| Alternative abstract: |
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| 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: |
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| 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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