55 research outputs found
Ultrastructure of the hen eggshell and its physiological interpretation
Financial losses from egg breakage have increased over the years. To seek any relation with shell strength, the structure of eggshell and shell membranes were examined by light microscope, transmission electron microscope and scanning electron microscope. They were taken from eggs laid by laying hens, from eggs removed from the oviduct and from eggs laid prematurely, and occasionally from incubated hen eggs and eggs of guinea-fowl, duck, turkey, emu and ostrich.The results with different methods of measurement showed how shell membranes vary in thickness, how some structural properties of shell may influence shell strength, how the shell and shell membranes form and how they are destroyed during incubation and what factors influence the cuticular surface of the eggs
Praktijkonderzoek Pluimveehouderij 1991
Het pluimvee praktijkonderzoek op 'Het Spelderholt' te Beekbergen gaat in de periode april - juni 1991 van start. Dit geeft meer mogelijkheden voor het praktijkonderzoek
Plan praktijkonderzoek voor de pluimveehouderij 1994
De afgelopen maanden is er uitvoerig overleg geweest over wat er in 1994 bij het praktijkonderzoek voor de pluimveehouderij in Beekbergen zal worden uitgevoer
Onderzoekprogramma 1990 voor praktijkonderzoek pluimveehouderij
Dit programma verschilt aanmerkelijk van voorgaande programma's, doordat met nieuwbouw van een zevental pluimveestallen voor praktijkonderzoek op 'Het Spelderholt' rekening is gehouden
Improvement of phosphorus availability by microbial phytase in broilers and pigs
Techniques have been developed to produce microbial phytase for addition to diets for simple-stomached animals, with the aim to improve phosphorus availability from phytate-P in plant sources. The activityof the crude microbial phytase showed pH optima at pH 5-5 and 2·5. The enzyme was able to degradephytate in vitro in soya-bean meal, maize and a liquid compound feed for pigs. When microbial phytasewas added to low-P diets for broilers the availability of P increased to over 60 % and the amount of Pin the droppings decreased by 50%. The growth rate and feed conversion ratio on the low-P dietscontaining microbial phytase were comparable to or even better than those obtained on control diets.Addition of microbial phytase to diets for growing pigs increased the apparent absorbability of P by24%. The amount of P in the faeces was 35% lower
Radioisótopo e modelagem matemática na avaliação da suplementação de fitase em dietas para suínos em crescimento
Caracterização parcial e utilização da fitase extraída de sementes germinadas de girassol
Avaliação da matriz nutricional da enzima fitase em rações contendo sorgo para poedeiras comerciais
Ação da fitase sobre a disponibilidade biológica do fósforo, por intermédio da técnica de diluição isotópica, em dietas com farelo de arroz integral para suínos
Praktijkonderzoekplan pluimveehouderij 1995
Het Praktijkonderzoek Pluimveehouderij heeft betrekking op de sectoren pluimvee, pelsdieren en konijnen en is ingedeeld naar de takken leghennen, vleeskuikens, vermeerdering (inclusief opfok) en broederij, kalkoenen, eenden, nertsen, vossen en konijnen. Per tak zal kort op het onderzoek voor 1995 worden ingegaan
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