7 Works

Nutrient digestibility and balance studies

Sadjad Danesh Mesgaran, Björn Kuhla, René Baumont, Gonzalo Cantalapiedra-Hijar, Pierre Noziére, Peter Lund, David Humphries & Jan Dijkstra
The nutritional value of a feed for cattle depends on its nutrient and energy contents, the extent of rumen fermentation and degradation, and the post-ruminal digestibility. Efficiency of digestion depends on different factors, for example, the apparent digestibility (estimated by subtracting the nutrients contained in faeces from the nutrients contained in dietary intake – unlike true digestibility where the endogenous and microbial amount is taken into account and corrected in final outcome) usually decreases when...

Rumen fluid sampling via oral stomach tubing method

Sanne van Gastelen, Wouter Muizelaar, Paolo Bani, Björn Kuhla, Mogens Larsen & David Yáñez-Ruiz
There are different purposes for collecting rumen fluid, e.g. assessment of rumen fermentation characteristics and rumen microbiota, as well as ex vivo incubations for feed analysis. Collecting rumen content through the fistula from rumen cannulated ruminants is considered the reference method for the collection of representative samples of rumen digesta, but access to surgically-modified animals is not universal and restricted to research facilities. Hence, a less invasive alternative has been developed: the oral stomach tubing...

Bodyweight, body condition and anatomy

Sadjad Danesh Mesgaran, Martin Weisbjerg, Alex Bach, Jennifer Salau, Jan Henning Haas, Wolfgang Junge, Georg Thaller & Björn Kuhla
Measuring bodyweight (BW) in cattle is essential for many research and management activities such as calculating dietary energy requirements for maintenance, calculating average daily gain and evaluating breeding values which include BW as a trait. Frequent monitoring of BW in dairy cows is necessary as changes in BW can help assess the energy balance of an animal. Precise understanding of BW gain of growing and fattening cattle or body mass changes during lactation is crucial...

The gas recovery test of respiratory chambers

Sadjad Danesh Mesgaran, Anne Louise Frydendahl Hellwing, Peter Lund, Michael Derno, Björn Kuhla, Marcel Heetkamp, Gemma Miller, David Humphries, Frederic Anglard, Yvanne Rochette, Cécile Martin, Tom Gardiner & Marc Coleman
Respiratory Chambers (RCs) were originally constructed with the purpose to study heat production from animals by quantifying oxygen (O2) consumption and carbon dioxide (CO2) production (initially detailed in the 18th century by Lavoisier and Leplace. Enteric methane (CH4) is measured in calorimetry studies, as CH4 is an energy loss. The RC can therefore be used to quantify the CH4 production from animals, and many new RC units have been constructed during the last decades with...

Feed and water intake

Sadjad Danesh Mesgaran, Björn Kuhla, David Humphries, Martin Weisbjerg, Peter Lund, Emer Kennedy, Michael O'Donovan, Michelle Liddane, Norann Galvin, Jan Dijkstra & René Baumont
Knowledge about dry matter intake (DMI) is a very important element in cattle management. Modern, high producing dairy cows require great amount of feed in order to meet the nutrient and energy requirements for maintenance and milk production, particularly during early lactation. In beef animals, current breeding strategies aim to select animals with low residual feed intake. Therefore, individual feed intake evaluation helps to identify the productivity and efficiency of each animal, in relation to...

Respiratory chamber facility

Sadjad Danesh Mesgaran, Michael Derno, Björn Kuhla, Karen Beauchemin, Cécile Martin, Anne Louise Frydendahl Hellwing, Peter Lund, Gemma Miller, David Humphries & Marcel Heetkamp
This guideline will highlight the key steps required when measuring gas exchange of cattle for the estimation of methane emission and heat production (by estimating the relation of emitted CO2 and CH4 to the consumed O2) via a respiration chamber (RC). The authors acknowledge the variation in RC design in different experimental units, and therefore, the mentioned steps within this guideline are common and essential for all. Note that a CO2 and/or CH4 recovery test...

Lameness detection and scoring

Sadjad Danesh Mesgaran, Juan Haladjian, Stefan Nüske, Dorothée Ledoux, Dave Humphries, Lene Munksgaard & Isabelle Veissier
Enting concluded lameness, from an economic perspective, as the third most costly health disease, following mastitis and reproductive failure issues, in cattle units. Archer estimated the incidence rate of lameness in the United Kingdom cattle herds roughly 50 cases/100 cows in a year; nevertheless, due to poor correlation between incidence rates and records of treatments in farms, the actual number seems to be higher. Surprisingly, the significance of lameness associated with cattle welfare, health and...

Registration Year

  • 2020
    7

Resource Types

  • Text
    7

Affiliations

  • Aarhus University
    7
  • Leibniz Institute for Farm Animal Biology
    7
  • Wageningen University & Research
    5
  • University of Reading
    5
  • National Research Institute for Agriculture, Food and Environment
    4
  • University of Clermont Auvergne
    4
  • Scotland's Rural College
    2
  • Estación Experimental del Zaidín
    1
  • National Physical Laboratory
    1
  • Technical University of Munich
    1