Maarten Th Frankenhuis

Learn More
We have identified a novel lentivirus prevalent in talapoin monkeys (Myopithecus talapoin), extending previous observations of human immunodeficiency virus-1 cross-reactive antibodies in the serum of these monkeys. We obtained a virus isolate from one of three seropositive monkeys initially available to us. The virus was tentatively named simian(More)
Abdominal testes of adult, naturally unilaterally cryptorchid boars were subjected to continuous artificial cooling for 5, 15, 25, or 45 days. This treatment initiated development of the spermatogenic epithelium. After a cooling period of 45 days there was complete differentiation in many seminiferous tubules. The results indicate that the spermatogenic(More)
Morphological changes become apparent shortly after birth in the abdominally located testes of the pig. To test the influence of temperature on gonocyte multiplication, scrotal testes of newborn piglets were subjected to continuous artificial heating. It was found that in the young pig during the first 2 weeks of life when the mitotic activity of the(More)
In order to study kinetics of the spermatogenic epithelium in the adult boar, a method has been developed to prepare seminiferous tubules mounted as a whole, after which these tubules have been processed and studied as described previously only for rats, mice and hamsters. The tubules were fixed in Zenker for 24 hours and stained with periodic acid - Schiff(More)
1. The aetiology of scabby hips was studied in broilers by scratching the skin with chicken claws, clipping the birds' claws and varying the effects of stocking density and food trough allocation. 2. Gentle scratching twice a week resulted in skin lesions that could not be distinguished from clinical scabby hips at slaughter. Interaction between birds(More)
The frequency of triploidy was studied in early chicken embryos and hatchlings and in adult chickens which showed symptoms of intersexuality at an early age. The incidence of triploid embryos in the strain involved was not very high (0.6%), but it appeared to increase significantly when embryos were studied from eggs laid by very young hens (4.4%). Among(More)
Male broilers of two genetically related stocks with divergent growth rates and feed conversion ratios were used to study metabolic backgrounds on the occurrence of pulmonary hypertension, heart failure, hypoxemia, and ascites in poultry. An experiment with a 2 x 2 x 2 x 2 factorial split-plot arrangement of treatments with 96 groups of 12 broilers was(More)
It is a well known fact that after removal of the left ovary in the young chicken, the right gonad starts growing and assumes the structure of an immature testis. In the cases reported in the literature active spermatogenesis rarely occurred. To bring autofertilisation of the hen closer to reality, we used ten day-old female embryos, whose gonads were(More)
Developments in intensive animal husbandry as well as the reactions called forth by this new form of livestock husbandry in various groups of society and in research workers are reviewed in the introductory part; it was only during the past few years that veterinary medicine in the Netherlands began to concern itself with the negative effects of intensive(More)