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Estimation of dairy goat body composition: A direct calibration and comparison of eight methods

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Sylvain Lerch (Agroscope, Suisse) et al., Methods, 2021, volume 186, février, p. 68-78

The objective was to compare eight methods for estimation of dairy goat body composition, by calibrating against chemical composition (water, lipid, protein, mineral and energy) measured post-mortem. The methods tested on 20 Alpine goats were body condition score (BCS), 3-dimension imaging (3D) automatic assessment of BCS or whole body scan, ultrasound, computer tomography (CT), adipose cell diameter, deuterium oxide dilution space (D2OS) and bioelectrical impedance spectroscopy (BIS). Regressions were tested between predictive variates derived from the methods and empty body (EB) composition. The best equations for estimation of EB lipid mass included BW combined with i) perirenal adipose tissue mass and cell diameter (R2 = 0.95, residual standard deviation, rSD = 0.57 kg), ii) volume of fatty tissues measured by CT (R2 = 0.92, rSD = 0.76 kg), iii) D2OS (R2 = 0.91, rSD = 0.85 kg), and iv) resistance at infinite frequency from BIS (R2 = 0.87, rSD = 1.09 kg). The D2OS combined with BW provided the best equation for EB protein mass (R2 = 0.97, rSD = 0.17 kg), whereas BW alone provided a fair estimate (R2 = 0.92, rSD = 0.25 kg). Sternal BCS combined with BW provided good estimation of EB lipid and protein mass (R2 = 0.80 and 0.95, rSD = 1.27 and 0.22 kg, respectively). Compared to manual BCS, BCS by 3D slightly decreased the precision of the predictive equation for EB lipid (R2 = 0.74, rSD = 1.46 kg), and did not improve the estimation of EB protein compared with BW alone. Ultrasound measurements and whole body 3D imaging methods were not satisfactory estimators of body composition (R2 ≤ 0.40). Further developments in body composition techniques may contribute for high-throughput phenotyping of robustness.

source : https://reader.elsevier.com/reader/sd/pii/S1046202320301407?token=7AFF32A92CED9F97FEF83FD31ACBF07C617A519A96EBC2508702057978936FBA06C14FD12CE2088CB276DB560551A4A7

2021

Reducing environmental impacts of feed using multiobjective formulation: What benefits at the farm gate for pig and broiler production?

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Bertrand Méda (Inrae) et al., Animal, 2021, volume 15, n° 1, janvier, 9 pages

Feed production is the main contributor to several environmental impacts of livestock. To decrease environmental impacts of feed, those of feedstuffs should be considered during formulation. In particular, multiobjective feed formulation (MOF) can help reduce several environmental impacts simultaneously while keeping any increase in feed price moderate. The objective of this study was to assess environmental benefits of MOF at the farm gate for fattening pigs and broilers. For pigs, three feeding strategies were tested: classic 2-phase (2P), 2-phase with lower net energy content (2P −), and multiphase (MP). For broilers, two strategies were tested: classic 3-phase (3P) and 3-phase with higher digestible amino acid contents and lower metabolisable energy content (3P +). Diets were formulated using both least-cost formulation (LCF) and MOF, yielding six pig scenarios and four broiler scenarios. Environmental impacts at the farm gate were estimated using a modelling approach based on life cycle assessment. Indicators for six impact categories were then calculated: climate change (CC), cumulative non-renewable energy demand (CEDNR), acidification (AC), eutrophication (EU), land occupation (LO), and phosphorus demand (PD). As expected, MOF had lower farm-gate impacts than LCF (as much as − 13%), but the degree of decrease varied by feeding strategy and impact. For pigs, MOF was equally effective in all strategies at reducing PD (− 6 to − 9%) and AC (− 2%). In contrast, MOF was more effective in 2P and 2P − at decreasing CC (− 5% to − 7%), LO (− 9% to − 13%) and EU (− 6% to − 8%) than in MP (CC: − 2%; LO: − 4%; EU: − 3%). The benefit of MOF was found greater in 2P (− 7%) than in other pig strategies for CEDNR (− 3 to + 0%). For broilers, MOF was equally effective in both strategies tested at decreasing PD (− 12%), AC (− 2%), and EU (− 4%). For CC and CEDNR, MOF was more effective in 3P (CC: − 9%; CEDNR: − 11%) than 3P + (− 6% for both impacts), but not for LO (+ 3% in 3P vs − 1% in 3P +). These differences were due mainly to differences in animal performance (especially feed conversion ratio) among the strategies tested. Finally, in all scenarios, gross margin at the farm gate decreased with MOF comparatively to LCF (pigs: − 3% to − 11%); broilers: − 7% to − 11%). These results demonstrate the importance of comprehensive economic and environmental optimisation of feeding strategies by simultaneously considering feed impacts, animal performance, and manure management. To do so, further research is therefore required to develop new modelling tools.

Source : https://www.sciencedirect.com/science/article/pii/S1751731120300240/pdfft?md5=6073f5f360dd45a54064b0301408a5b4&pid=1-s2.0-S1751731120300240-main.pdf

2021

Human–animal relationship influences husbandry practices, animal welfare and productivity in pig farming

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Françoise Pol (Anses) et al., Animal, 2021, volume 15, n° 2, 10 pages

The nature of the relationship between humans and farm animals has multiple repercussions on the animals and the farmers and varies with farmers attitudes towards their animals. In particular, this relationship influences animal welfare and human working conditions. The present study, part of a larger research project investigating human–animal relationship (HAR) in pig farming and ways to improve it, had two objectives: 1) to investigate the HAR in a diversity of pig farming situations and to evaluate the possible correlation between farmer attitudes, pigs' reactions to humans, husbandry practices, animal health, welfare and productivity and 2) to find a way to rapidly assign a farmer to a profile, in order to better adapt course content during training sessions on HAR. The study focused on 52 farrow-to-finish farms and consisted of a semi-structured interview with the farmer, observations of the farmer in contact with his/her livestock, two human approach tests conducted on sows and growers and productivity data. Finally, a questionnaire was left at the farm to be filled out by all stockpersons on the farm. Interviews, analyzed using a thematic analysis followed by multiple correspondence analysis and ascendant hierarchical clustering, showed that some farmers develop husbandry practices to improve their HARs and identified three farmer profiles that have been named in relation to the place of the HAR in their profession: Profile 1 farmers for whom HAR is secondary in their work with their pigs, Profile 2 for whom the HAR is useful in their work with their pigs and Profile 3 for whom HAR is central in their work with their pigs. Logistic regression models of the relationships between behavioral tests and productivity data showed that confident sows produce and wean more piglets than fearful sows and that sows of Profile 3 farmers trust more humans than those of Profile 1 or 2 farmers. Farmers' responses to the questionnaire did not predict their profile assignment. Our results confirm the main role of the farmer's attitude towards animals on their farming practices, animal welfare and productivity. The farmers who have more confident pigs and better productivity are those for whom the farm animal is central to their profession, express the most pleasure in working with them and convey empathy for them.

https://www.sciencedirect.com/science/article/pii/S1751731120301051/pdfft?md5=15c30d0146a25883a027ebd1551c29ab&pid=1-s2.0-S1751731120301051-main.pdf

2021

Ventilation partagée et lavage, un duo gagnant

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Nadine Guingand, Réussir Porc/ Tech Porc (FRA), 2021, n°286, février-mars, p. 22-24

À la station expérimentale de l’Ifip à Romillé, un nouveau concept de ventilation et de lavage permet un investissement et des frais de fonctionnement moins important pour une efficacité équivalente à un laveur classique.

PDF icon Nadine Guingand, Réussir Porc/ Tech Porc (FRA), 2021, n°286, février-mars, p. 22-24
2021

Dimensionner correctement la gaine d’extraction

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Yvonnick Rousselière, Réussir Porc/ Tech Porc (FRA), 2021, n° 286, février-mars, p. 24

Avec un double système de ventilation partagée,..

PDF icon Yvonnick Rousselière, Réussir Porc/ Tech Porc (FRA), 2021, n° 286, février-mars, p. 24
2021

Programme des e-formations Teach In Pig

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PDF icon fiche_formation_eleraning_2.pdf
2021
GBP de biosécurité pour le transport des porcs

GBP de biosécurité pour le transport des porcs

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Les données scientifiques actuelles ne permettent pas d’établir de manière certaine les procédures et les équipements nécessaires pour assurer l’efficacité des opérations de nettoyage-désinfection des véhicules de transport de porcs vivants en particulier sur les.

PDF icon GBP de biosécurité pour le transport des porcs
2021

L’intelligence artificielle pour détecter les porcelets immature

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Pauline Brenaut, Réussir Porc/Tech Porc (FRA), 2021, n° 287, avril, p. 36-37

Le niveau de maturité des porcelets à la naissance pourrait devenir un nouveau critère de sélection afin d’améliorer leur taux de survie en cours de lactation, grâce à l’intelligence artificielle.

PDF icon Pauline Brenaut, Réussir Porc/Tech Porc (FRA), 2021, n° 287, avril, p. 36-37
2021

Chemical reactivity of nitrite and ascorbate in a cured and cooked meat model implication in nitrosation, nitrosylation and oxidation

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Aline Bonifacie (Inrae/Ifip) et al., Food Chemistry, 2021, volume 348, 30 juin, 9 pages

Nitrite, added to cured meat for its bacteriological and technological properties, is implicated in the formation of nitroso compounds (NOCs), such as nitrosylheme, nitrosamines and nitrosothiols, suspected to have a potential impact on human health. The mechanisms involved in NOC formation are studied in regard with the dose–response relationship of added nitrite and its interaction with ascorbate on NOC formation in a cured and cooked meat model. The impact of a second cooking stage on nitrosation was evaluated. The addition of nitrite in the cured and cooked model promoted heme iron nitrosylation and S-nitrosation but not N-nitrosation. Nitrite reduced lipid oxidation without an additional ascorbate effect. The second cooking sharply increased the nitrosamine content while the presence of ascorbate considerably lowered their levels and protected nitrosothiols from degradation. This study gives new insights on the chemical reactivity of NOCs in a cured meat model.

2021

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