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Dive into the research topics where Erwan Cutullic is active.

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Featured researches published by Erwan Cutullic.


Animal Reproduction Science | 2009

Hierarchy of factors affecting behavioural signs used for oestrus detection of Holstein and Normande dairy cows in a seasonal calving system

Erwan Cutullic; Luc Delaby; David Causeur; G. Michel; Catherine Disenhaus

As oestrous expression of dairy cows has decreased over the last decades oestrus detection has become more difficult. The objective of this study is to identify the main factors that affect oestrus detection in seasonal calving dairy cows, and to establish their relative importance. In each of 5 years 36 Normande and 36 Holstein cows were assigned to a Low or High winter-feeding level group. Half of each group was then assigned to a Low or High pasture-feeding group. The Low-Low strategy resulted in the lowest milk yield and the greatest body condition (BC) loss from calving to nadir BC score (6302 kg; -0.98 unit). The High-High strategy had the converse effect (7549 kg; -0.75 units). Low-High and High-Low strategies had intermediate values. The Normande cows had lower milk yield and BC loss than Holstein cows (6153 kg versus 7620 kg; -0.82 unit versus -1.20 unit). A database of 415 observed spontaneous oestruses was created. Oestruses were classified according to detection signs: (1) standing to be mounted, (2) mounting without standing, (3) other signs without standing or mounting (slight signs). Presence of another cow in oestrus, access to pasture, Normande breed and Low-Low strategy increased standing detection. In the Normande breed, 97% of oestruses were detected by standing while combining the presence of a herdmate in oestrus and access to pasture with a milk production of less than 6550 kg. Holstein cows had a higher frequency of slight signs oestruses than Normande ones, which was associated with a decreased subsequent calving rate (P<0.05). In multiparous Holstein cows, the odds of slight signs detection was multiplied by 7.8 for the High-High group in comparison with the Low-Low group (P<0.05). In our study milk yield had an effect on oestrus detection which was not explained by BC loss. As High-High cows produced more milk than others, we logically found that an increase in milk yield increased slight signs detection. Conversely, as they lost less BC than others, BC loss improved the chance of standing or mounting detection. These two results show that an increase in milk yield may reduce oestrous behaviour even if BC loss is moderate. Oestrus detection is crucial in seasonal compact calving systems. High phenotypic milk yields appear unsuitable with such systems in regard to depressed oestrous behaviour.


Animal | 2011

Dairy cows' reproductive response to feeding level differs according to the reproductive stage and the breed.

Erwan Cutullic; Luc Delaby; Yves Gallard; Catherine Disenhaus

Reproductive performance has decreased over the last decades in many dairy systems. This study aimed at comparing the effects of a high- and a low-feeding level on reproductive stages (cyclicity, oestrus and fertility) of Holstein and Normande cows in a grass-based winter compact calving system. High-fed cows received a total mixed ration composed of 55% maize silage, 15% dehydrated alfalfa pellets and 30% concentrate in winter and 4 kg/day concentrate supply at grazing. Low-fed cows only received 50% grass silage and 50% haylage in winter and no concentrate at grazing. Low-fed cows produced less milk over 44 weeks, but lost more body condition (BC) than high-fed ones (5207 v. 7457 kg, -1.28 v. -0.96 unit, P < 0.001). Normande cows produced less milk and lost less BC than Holstein ones (5596 v. 7068 kg, -0.89 v. -1.36 unit, P < 0.001). Post-partum ovarian activity was little affected by the feeding level. In both breeds, ovulation detection rate was higher in low-fed cows (74% v. 59%, P < 0.001) and detection relied more frequently on standing behaviour (67% v. 55%, P = 0.022). In both breeds, the recalving rate following the first and second inseminations was not significantly affected by the feeding level, although more non-fertilisations or early embryo mortalities occurred in low-fed cows (43% v. 26%, P = 0.004). For the Holstein breed, this was clearly explained by more late embryo mortalities in high-fed cows (30% v. 9%, P = 0.004). Finally, pregnancy rate by the end of the 13-week breeding period was similar between feeding groups. Conversely, the Normande dual-purpose cows had a higher pregnancy rate by the end of the breeding period than the Holstein dairy cows (72% v. 54%, P = 0.007), owing to a better ovarian activity (79% v. 54% normal, P < 0.001) and a higher recalving rate following insemination (53% v. 37%, P = 0.007). In conclusion, this study demonstrates that feeding levels with converse effects on milk yield and BC score also have converse effects on reproductive stages and lead to quite similar final reproductive performance in compact calving systems. Normande cows benefit from an overall better reproductive performance, but do not suit high feeding levels for very compact calving systems owing to depressed oestrous behaviour.


Animal | 2012

Towards a better understanding of the respective effects of milk yield and body condition dynamics on reproduction in Holstein dairy cows.

Erwan Cutullic; Luc Delaby; Yves Gallard; Catherine Disenhaus

The overall reproductive performance has decreased over the last decades, involving changes in cyclicity, oestrous behaviour and fertility. High milk yield (MY), low body condition score (BCS) and large body condition (BC) loss have been identified as risk factors. However, these effects are often confounded, as high MY and body lipid reserve mobilization are correlated. The aim of this study was to evaluate the respective effects of MY and BC on post-partum ovarian cyclicity, oestrus and fertility of Holstein cows. This study provides novel information, as MY and BC change were uncoupled in the overall dataset that included 98 lactations and milk progesterone profiles. Cows were assigned to two feeding-level groups: high feed, which achieved high MY and moderate BC loss throughout lactation (8410 kg, -1.17 unit from calving to nadir BCS), and low feed, which limited MY and triggered a large BC loss (5719 kg, -1.54 unit). MY and BC had different effects at different stages of the reproductive process. Cyclicity as well as non-fertilization and early embryo mortality were mainly driven by body lipid reserves, whereas oestrous behaviour and late embryo mortality were related to MY. The results point to possible uncoupling between cyclicity, oestrus and early and late embryo survival allowing compensation along the reproductive process and leading to similar final reproductive performance. In compact calving systems, which require high pregnancy rates within a short period, higher MY strategies appear unsuitable even where BCS is maintained, owing to depressed oestrous behaviour and probably increased late embryo mortality, which delays rebreeding. Similarly, strategies that compromise cyclicity and fertility by excessively low BCS are unsuitable.


Animal | 2013

An individual reproduction model sensitive to milk yield and body condition in Holstein dairy cows.

Laure Brun-Lafleur; Erwan Cutullic; Philippe Faverdin; Luc Delaby; Catherine Disenhaus

To simulate the consequences of management in dairy herds, the use of individual-based herd models is very useful and has become common. Reproduction is a key driver of milk production and herd dynamics, whose influence has been magnified by the decrease in reproductive performance over the last decades. Moreover, feeding management influences milk yield (MY) and body reserves, which in turn influence reproductive performance. Therefore, our objective was to build an up-to-date animal reproduction model sensitive to both MY and body condition score (BCS). A dynamic and stochastic individual reproduction model was built mainly from data of a single recent long-term experiment. This model covers the whole reproductive process and is composed of a succession of discrete stochastic events, mainly calving, ovulations, conception and embryonic loss. Each reproductive step is sensitive to MY or BCS levels or changes. The model takes into account recent evolutions of reproductive performance, particularly concerning calving-to-first ovulation interval, cyclicity (normal cycle length, prevalence of prolonged luteal phase), oestrus expression and pregnancy (conception, early and late embryonic loss). A sensitivity analysis of the model to MY and BCS at calving was performed. The simulated performance was compared with observed data from the database used to build the model and from the bibliography to validate the model. Despite comprising a whole series of reproductive steps, the model made it possible to simulate realistic global reproduction outputs. It was able to well simulate the overall reproductive performance observed in farms in terms of both success rate (recalving rate) and reproduction delays (calving interval). This model has the purpose to be integrated in herd simulation models to usefully test the impact of management strategies on herd reproductive performance, and thus on calving patterns and culling rates.


Journal of Dairy Science | 2009

Breed comparison of post partum ovarian activity in cows

Catherine Disenhaus; Erwan Cutullic; Fabienne Blanc; Jacques Agabriel


Journal of Dairy Science | 2008

Consequence on reproduction of two feeding levels with opposite effects on milk yield and body condition loss in Holstein and Normande cows

Erwan Cutullic; L. Delaby; G. Michel; Catherine Disenhaus


Rencontres autour des recherches sur les ruminants | 2010

Vers une cohérence des pratiques de détection des chaleurs: intégrer la vache, l'éleveur et le système d'élevage

Catherine Disenhaus; Erwan Cutullic; Sandrine Freret; Pierre Paccard; Claire Ponsart


Archive | 2014

Integrating mitigation and adaptation options for sustainable livestock production under climate change– SICA (Latin America, African Mediterranean Partner Countries, African ACP)

Nicholas J. Hutchings; Margit Styrbæk Jørgensen; Ib Silleback Kristensen; Erwan Vejlin; Erwan Cutullic; Philippe Faverdin


65. Annual Meeting of the European Federation of Animal Science (EAAP) | 2014

Low protein degr adability and precision protein feeding improve nitrogen efficiency of dairy cows

Erwan Cutullic; Luc Delaby; Nadège Edouard; Philippe Faverdin


13. Journées de l'Animation transversale "Glande mammaire, lait" | 2014

L'alimentation de précision pour accroître l'efficience par une prise en compte de la variabilité individuelle : exemple de l'alimentation protéique

Philippe Faverdin; Erwan Cutullic; Luc Delaby; Nadège Edouard

Collaboration


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Catherine Disenhaus

Institut national de la recherche agronomique

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Luc Delaby

Institut national de la recherche agronomique

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Philippe Faverdin

Institut national de la recherche agronomique

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Yves Gallard

Institut national de la recherche agronomique

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Frederic Dessauge

Institut national de la recherche agronomique

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G. Michel

Institut national de la recherche agronomique

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Marion Boutinaud

Institut national de la recherche agronomique

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Nadège Edouard

Institut national de la recherche agronomique

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