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Biomedical subjects

B van Haaften

Publications and source records attributed to B van Haaften.

7 recordsLinked to original sources
PubMed1992

[Fertility problems in the bitch].

A short review of the oestrous cycle is given, followed by a more detailed look at fertility problems caused by husbandry aspects, anatomical abnormalities, hormonal disturbances and infectious aetiologies. One of the principal causes of fertility problems appears to be mating at an inappropriate time. The ovulation period and therefore the correct time of mating can however, be defined by measuring progesterone levels in peripheral blood three times a week. Vaginoscopy can also be used for this purpose, but is a subjective and less reliable method. Sterility is normally the single symptom of cystic endometrial hyperplasia(-mucometra). This probable major cause of sterility can sometimes be diagnosed with echoscopy but sometimes only during laparotomy. Additionally, hormonal disturbances can precipitate problems such as a persistent (pro-)oestrus, a split heat, or an abnormally long interoestrous interval. Bromocriptine, 15-20 micrograms/kg body-weight, twice daily orally, can be used to induce oestrus if no obvious abnormalities are diagnosed. Attention is paid to fertility problems with an infectious aetiology, such as herpes virus or Brucella canis. A vaginitis or abnormal bacterial growth in the vagina can also influence fertility. Unfortunately, little is known about bacterial growth in the vagina in relation to fertility problems. More research is needed in this field.

Animals↗
PubMed1989

Timing the mating of dogs on the basis of blood progesterone concentration.

The optimal time for mating bitches was determined by measuring the progesterone concentration in peripheral blood three times a week after the start of vulval bleeding. Of 104 bitches with reduced fertility 81 (78 per cent) became pregnant and of 112 bitches with normal fertility 105 (94 per cent) became pregnant. Of 121 bitches mated once, 102 (84 per cent) became pregnant, and of 95 bitches mated more than once, 84 (88 per cent) became pregnant. The mean (+/- sd) interval between the start of vulval bleeding and the optimal time for mating in 88 bitches was 11.8 +/- 3.1 days. The blood progesterone concentration appears to be an excellent indicator of the best time for mating, particularly in bitches with reduced fertility.

Animals↗
PubMed1989

[The optimal service period in bitches].

The fertile period in bitches as estimated from the findings reported in the literature is discussed. Fertile periods of oocytes and spermatozoa are examined extensively. The period of ovulation is found to be more closely associated with hormonal changes than it is with symptoms of oestrus. This period occurs when the concentration of progesterone in the blood increases to a level higher than (16 nmol/l). Service one and a half days after the ovulation period results in high pregnancy rates.

Animals↗
PubMed1989

[Pyometra in an ovariectomized cat following treatment with proligestone].

A nine-year-old cat was presented for a purulent vaginal discharge which had been present for five months. She had been ovariectomised at the age of one; for the last two years she was treated with proligestone because of a dermatological condition. A pyometra was found to be present on laparotomy.

Animals↗