Parcourir par auteur "Tolkamp, B. J."
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Body fatness affects feed intake of sheep at a given body weight
Tolkamp, B. J.; Emmans, G. C.; Kyriazakis, I. (2006)In a 1-yr experiment, nutritional treatments were used to produce different combinations of BW and BCS in lambs. The experiment served to quantify the effects of BW and BCS on ADFI by sheep. Ewe lambs (n = 78) were assigned ... -
Changes in feeding behavior as possible indicators for the automatic monitoring of health disorders in dairy cows
Gonzalez, L. A.; Tolkamp, B. J.; Coffey, M. P.; Ferret, A.; Kyriazakis, I. (2008)Changes in short-term feeding behavior of dairy cows that occur with the onset of the health disorders ketosis, acute locomotory problems, and chronic lameness were investigated using data collected during previous ... -
Changes in food intake and circulating leptin due to gastrointestinal parasitism in lambs of two breeds
Zaralis, K.; Tolkamp, B. J.; Houdijk, J. G. M.; Wylie, A. R. G.; Kyriazakis, I. (2008)HA reduction in food intake is a prominent feature of many infectious diseases. However, the underlying mechanisms of parasite-induced anorexia in sheep are poorly understood. Here, we tested the hypotheses (a) that the ... -
Consequences of infection pressure and protein nutrition on periparturient resistance to Teladorsagia circumcincta and performance in ewes
Kidane, A.; Houdijk, J. G. M.; Tolkamp, B. J.; Athanasiadou, S.; Kyriazakis, I. (2009)The consequences of protein nutrition on the degree of periparturient relaxation of immunity to nematode parasites in sheep may be more pronounced at higher levels of infection pressure. Here, we investigated interactive ... -
Consequences of protein supplementation for anorexia, expression of immunity and plasma leptin concentrations in parasitized ewes of two breeds
Zaralis, K.; Tolkamp, B. J.; Houdijk, J. G. M.; Wylie, A. R. G.; Kyriazakis, I. (2009)The periparturient relaxation of immunity (PPRI) against parasites in ewes has a nutritional basis. We investigated whether ewes experience a reduction in food intake (anorexia) during PPRI and if the magnitude of anorexia ... -
Effects of maternal protein nutrition and subsequent grazing on chicory (Cichorium intybus) on parasitism and performance of lambs
Kidane, A.; Houdijk, J. G. M.; Athanasiadou, S.; Tolkamp, B. J.; Kyriazakis, I. (2010)Forty-eight 4- to 5-yr-old Blackface x Bluefaced Leicester (Mule) ewes and their 24-d-old twin lambs were used to assess the effects of maternal protein nutrition and subsequent grazing on chicory (Cichorium intybus) on ... -
Effects of nematode infection on anorexia and leptin levels in lambs of two breeds
Zaralis, K.; Tolkamp, B. J.; Houdijk, J. G. M.; Wylie, A. R. G.; Kyriazakis, I. (2007)The objective of this study was to investigate whether breed differences in production potential are associated with differences in the occurrence of anorexia following a nematode infection and whether plasma leptin ... -
'Freedom from hunger' and preventing obesity: the animal welfare implications of reducing food quantity or quality
D'Eath, R. B.; Tolkamp, B. J.; Kyriazakis, I.; Lawrence, A. B. (2009)In animals, including humans, free access to high-quality (generally energy-dense) food can result in obesity, leading to physiological and health problems. Consequently, various captive animals, including laboratory and ... -
A novel flexible method to split feeding behaviour into bouts
Howie, J. A.; Tolkamp, B. J.; Avendano, S.; Kyriazakis, I. (2009)Before meal patterns can be analysed properly, a biologically relevant meal criterion must be determined in order to group short-term feeding behaviour into meals. Existing methodologies are based on modelling of the ... -
Predicting the effects of body fatness on food intake and performance of sheep
Tolkamp, B. J.; Yearsley, J. M.; Gordon, I. J.; Illius, A. W.; Speakman, J. R.; Kyriazakis, I. (2007)Adipose tissue produces signals that can have a profound effect on many physiological functions, including energy expenditure and food intake. The hypothesis that variation in food intake of sheep resulting from differences ... -
Short-term feeding behaviour has a similar structure in broilers, turkeys and ducks
Bley, T.; Kyriazakis, I.; Howie, J. A.; Tolkamp, B. J. (2010)1. This study is the first to quantitatively compare the structure of feeding behaviour of broilers, ducks and turkeys as recorded by electronic feeders. It tests the hypothesis that this structure is so similar that the ... -
The structure of feeding behavior in commercial broiler lines selected for different growth rates
Howie, J. A.; Tolkamp, B. J.; Avendano, S.; Kyriazakis, I. (2009)Selection for increased growth rate in livestock is accompanied by increased requirements for food resources. It has been suggested that more intensively selected birds, such as broilers, have altered food intake control ... -
Toward a new practical energy evaluation system for dairy cows
Tolkamp, B. J.; Kyriazakis, I. (2009)Energy evaluation systems translate an animal's net energy (NE) requirements into feed metabolisable energy requirements (MER). The Feed into Milk (FiM) project (Agnew RE, Yan T, France J, Kebreab E and Thomas C 2004. ...