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Biomedical subjects

U Haye

Publications and source records attributed to U Haye.

3 recordsLinked to original sources
PubMed1981

Selection for sperm quality in White Plymouth rocks.

A selection for sperm quality was carried out in the White Plymouth Rock population of the Spelderholt institute. The percentage of morphologically abnormal spermatozoa was used as the most important selection criterion. The population was selected in two directions, viz. a line with a low incidence (Ll-line) of abnormal spermatozoa and a line with a high incidence (Hl-line). Cocks were examined and selected at the age of 26 weeks with the help of vital stained sperm smears. The selection response in the Ll-line appeared to be very evident; in the Hl-line the results were more variable. An indirect effect of selection on 8-week bodyweight could be established.

Animals↗
PubMed1978

Twisted legs in broilers.

The effect of various factors on the incidence of leg abnormalities, with particular reference to twisted leg, in broilers was studied. The incidence of twisted legs was influenced by strain and for males was twice that for females. There was also a higher incidence in cages than on litter with the type of cage floor having an effect: broilers reared on floors of metal wire and perforated sheets had more leg problems than those reared on plastic mats and plastic-covered wire. Although vitamin and mineral supplementation had no effect on caged broilers, a restriction of metabolisable energy (ME) intake during the first 14 d after hatching halved the frequency of leg abnormalities compared with those fed ad libitum. Studies of cage size and location of water suggested that a lack of exercise increases the incidence of leg abnormalities.

Animals↗