Abstract
The aim of this study was to evaluate the presumptive factors might be responsible for repeat breeding syndrome of cows in Bangladesh. The study was conducted in different villages around the Faculty of Animal Science and Veterinary Medicine, Patuakhali Science and Technology University, Outer campus, Barisal during the period from July to September 2017. A total of 100 repeat breeder cows were evaluated considering different presumptive influencing factors such as breed, age, parity, body condition score (BCS), fetal death, retention of placenta, post-partum endometritis, abortion, dystocia and managemental practices of cows. It was found that there was no significance (p>0.05) effect of parity and age of cows on the occurrence of repeat breeding syndrome in local and crossbred cows. Repeat breeding syndrome was significantly higher in BCS 2.0 to 2.5 in local breed and 3.0 to 3.5 in crossbred cows than that of other groups. In the study animals, dystocia was 4.0%, fetal death was 58.2%, retention of placenta was 57.1%, post-partum endometritis was 4.1% in crossbred cows. Cows in semi-intensive system raring had significantly (P<0.05) higher (53.1%) of repeat breeding than that of others systems. Animals that were not dewormed (73.5%) and vaccinated (92.9%) had 73.5 % and 92.9% repeat breeding syndrome affected cows, respectively. It may concluded that simultaneously multiple factors such as irregular deworming and vaccination, subclinical endometritis, hormonal imbalance, early embryonic death due to low progesterone level, failure of proper heat detection and so on, might be also responsible to the occurrence of repeat breeding syndrome in cows.Res. Agric., Livest. Fish.5(1): 49-55, April 2018
Highlights
The cattle population in Bangladesh is rising day by day and getting the self-capability to meet up the demand of milk and meat protein for the nation
The questionnaire included the information about breed, parity, age, body condition score (BCS), number of artificial insemination (AI), history of dystocia in last calving, retention of placenta after calving, visible post partum endometritis, abortion, feeding system, oestrus sign, calf feeding, deworming, vaccination and showering of cow
The rate of repeat breeding in ≤3 years,3-4 years and ≥5 years old cows were 19.4,15.3 and 23.5%, respectively in local breed and 10.2,15.3,18.4%, respectively in crossbred cows (Table1).There is no significance (P>0.05) difference of age factors for repeat breeding at less than 3 years but respectively higher responsible more than 5 years. This results is supported by the study of Asaduzzaman et al (2016) who recorded the effects of age of cows on occurrence of repeat breeding significantly lower proportion of cows (29.7 to 33.1%) was affected with repeat breeding at 3-6 years of age than that of 7-13 years of age (37.1 %; P
Summary
The cattle population in Bangladesh is rising day by day and getting the self-capability to meet up the demand of milk and meat protein for the nation. One calf per year is important factor for profitable dairying (Paul et al, 2011). A RB cow looks apparently healthy and has regular estrus cycle (Warriach et al, 2008). The incidence of repeat breeding in dairy cows, worldwide, ranges from 3 to 10%, (Bartlett et al, 1986; Kimura et al, 1987). The potential causes of the repeat breeding mainly include subclinical endometritis (Rao et al, 1982; Ahmed et al, 2013), nutritional deficiency, specially trace minerals and vitamin A (Frances et al, 1977; Peters, 1996; Ahmed et al, 2009), age of the dam (Bartlett et al, 1986), improper heat detection (Dekriuf et al, 1978), and endocrine dysfunction (Gustafsson et al, 1986; Bage et al, 1997)
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