Comparative assessment of treatment methods of retained fetal membranes and their effects on the subsequent lactation and reproduction in cows. Doctoral thesis for the scientific degree of Ph.D. | Augļa segu aiztures ārstēšanas metožu salīdzinošs vērtējums un to ietekme uz govju turpmāko laktāciju un reprodukciju. Promocijas darbs zinātniskā doktora grāda (Ph.D) iegūšanai Veterinārmedicīnas zinātnē, 2021.
2021
Skuja, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia). Faculty of Veterinary Medicine. Clinical Inst.
Retention of the fetal membranes (RFM) comprises a failure of dehiscence and a lack of expulsion of fetal membranes within the duration of the calving's physiological third stage. The causes of RFM are various ones – from genetics, nutrition, hormonal disorders, high milk yield, sex or number of offspring, stillbirths, micronutrient and vitamin deficiencies, heat, age of the animal and many other factors that can affect the development of RFM. For the first time in Latvia, three RFM treatment methods have been compared in the doctoral thesis. The study took place over three years – from 2006 to 2009 – in two herds of Zemgale region with the same keeping, feeding, and milking system. The study aimed to find out the most cost-effective and suitable treatment method of retained fetal membranes in Latvian conditions, which would have a positive effect on further lactation and reproduction of cows. The following objectives have been set to achieve the goal: 1. to evaluate uterine involution using rectal and ultrasonographic examination, as well as ovarian functional status, using a rectal, ultrasonographic, and immunohistochemical examination of cows with and without fetal retention; 2. to explore the morphological and biochemical parameters of blood and the dynamics of progesterone levels in the blood serum of cows with and without the retention of fetal membranes; 3. to analyse the bacterial microflora of cows' uterus with and without the fetal membranes' retention; 4. to analyze the histological picture of the uterus endometrium on day 42 after calving in cows with and without retention of the fetal membranes, using histological and immunohistological examination; 5. to evaluate the effect of different treatment methods of retained fetal membranes on further lactation, using milk yield and somatic cell count parameters; 6. to evaluate the effectiveness of different treatment methods for cows with fetal membranes retention, using reproductive indicators; 7. to calculate the economic costs of cows with fetal membrane retention.
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