[Control of Salmonella on dairy farms].
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Animals↗
Biomedical subjects
J Veling
Publications and source records attributed to J Veling.
[Selenium deficiency without clinical symptoms in young cattle on a dairy farm].
On a dairy farm a selenium deficiency was diagnosed on the basis of the blood chemistry of heifer calves. Of ten heifers, aged five to fourteen months, six animals had a glutathione peroxidase (GSH-PX) activity lower than 10 U/gHb. A good correlation was found between this low GSH-Px-activity and the selenium concentration in the blood. The animals had no symptoms of selenium deficiency nor elevated CPK levels. On the basis of the vitamin E-concentration in the blood it is postulated that the lack of symptom is mainly caused by the amount of vitamin E in the ration (grass and grass silage).
Animal Feed↗
[An outbreak of bovine tuberculosis on a dairy farm].
An outbreak of bovine tuberculosis on a dairy farm is described. Following intradermal tuberculination 84 animals out of 111 animals older than 6 weeks had a positive reaction. Of the 34 adult sheep one gave a positive reaction. All animals on the farm were taken over for destruction by the Animal Health Centre. The source of the infection could not be established although there was a strong suspicion that the importation of three older dairy cows had introduced the infection on the farm. A further investigation was done on 45 farms. Two of these farms were infected by buying animals from the dairy farm in question. During the investigations the possible transmission of the infections to people who were in close contact to the infected animals was also investigated. From 35 examined persons 5 had a positive Mantoux-reaction. The outbreak coincided with a political discussion concerning the abolishment of the periodical tuberculination on dairy farms. Since 1 January 1993 the surveillance of bovine tuberculosis in the Netherlands is done by import control and findings in slaughter-houses combined with a good identification system. It is stressed that the examinations of the lymph glands in the slaughter-houses require the necessary attention.
Animals↗
[Cows with swollen anus and vulva as a husbandry problem].
An acute farming problem is described. The symptoms were poor intake of concentrates, swelling of the anus and vulva, and decreased milk production. Research results show that pig premix was incorporated into the concentrate for dairy cows. Which component of the concentrate was responsible for the symptoms remains to be established.
Animal Feed↗
Haemorrhagic claw lesions in newborn piglets due to selenium toxicosis during pregnancy.
In a sow herd piglets were born with haemorrhagic lesions on the proximal wall and sole of the claws of all their feet due to abnormal horn formation. High concentrations of selenium were detected in the liver and kidney of the piglets and appeared to be associated with these lesions. A selenium rich premix added to the rations of the sows in the second half of gestation was the origin of this selenium intoxication.
Animals↗
Growth of rearing calves in relation to lysine contents of milk replacer and calf starter and feeding frequency of milk replacer.
In two factorial feeding experiments with 90 and 102 rearing calves the effect of addition of extra lysine to the milk replacer in combination with a low and high lysine content of the calf starter on dry matter intake and weight gain was studied. Once or twice daily milk feeding was also compared. The calves received milk replacer up to the age of 8 weeks and calf starter and hay ad libitum from the 3rd week on. The experiments lasted to the age of 12 respectively 10 weeks. In the first experiment increasing the lysine content of the milk replacer from 14.5 g/kg to 18.5 g/kg had no effect on dry matter intake and weight gain. In the second experiment increasing the content of lysine to 17 g/kg resulted in higher intake of dry matter and higher weight gain, but only in combination with a calf starter with a low lysine content (6 g/kg). In the first experiment twice daily milk feeding resulted in higher intake of concentrate and higher weight gain as compared to once daily. In the second experiment this was only so if the starter had the lower lysine content. Increasing the lysine content of calf starter from 7 to 8.5 g/kg had no effect on dry matter intake and weight gain in the preweaning period in the first experiment. In the second experiment increasing the lysine content from 6 to 8.5 g/kg led to higher intake of concentrate and higher weight gain. This effect was only seen if the milk replacer had no extra lysine added. In the postweaning period there was no effect of increasing the lysine content from 7 to 8.5 g/kg (Exp. I). Increasing the lysine content from 6 to 8.5 g/kg led to higher dry matter intake and higher weight gain (Exp. II). These results are discussed in the light of the partial degradability of the concentrate protein in the rumen and the effect of duodenally available lysine on feed intake and weight gain.
Amino Acids↗