Pregnancy loss in dairy cows: the contributing factors, the effects on reproductive performance and the economic impact

다국어 초록 (Multilingual Abstract)

This study investigated the effects of the herd, cow parity, the insemination protocol and season on the incidence of pregnancy loss (PL) in dairy herds. Furthermore, we determined the downstream effects of PL on reproductive performance and its economic impact. The overall incidence rate of PL was 6.9% in 1,001 pregnant cows and its incidence peaked (p < 0.01) during the second trimester of gestation. GLIMMIX analysis revealed that cow parity was the important risk factor for the PL. The odds ratio showed that the likelihood of PL in cows with parities of 1 or 2 was decreased by 0.6 or 0.5 fold compared to the cows with a parity of 3 or higher. Following PL, the mean rate of endometritis was 23.2% and endometritis was more common (p < 0.05) when PL occurred during the third trimester than during the first and second trimesters. The mean culling rate was 46.4% and this did not differ with the period of PL. The overall mean intervals from PL to the first service and conception were 63.4 and 101.8 days, respectively. The mean interval from PL to first service was longer (p < 0.01) for cows with PL during the third trimester than for the cows with PL during the first and second trimesters. The economic loss resulting from each PL was estimated at approximately $2,333, and this was largely due to an extended calving interval and increased culling. These results suggest that cow parity affects the incidence of PL, which extends calving interval and causes severe economic loss of dairy herds.

참고문헌 (Reference)

1 "Veterinary Reproductive Ultrasonography. 1st ed" Schlutersche, Hannover 122-131, 2004

2 "Use of pregnancy specific proteins and progesterone assays to monitor pregnancy and determine the timing, frequencies and sources of embryonic mortality in ruminants" 56 : 1417-1433, 2001

3 "The frequency of endemic fetal loss in dairy cattle: A review" 43 : 989-1000, 1995

4 "The effect of embryonic death rates in cattle on the efficacy of estrus synchronization programs" 513-535, 2004

5 "The SAS System for Windows" Release 9.1,SAS Institute, Cary 2004

6 "Stage of cycle, incidence, and timing of ovulation, and pregnancy rates in dairy cattle after three timed breeding protocols" 84 : 1051-1059, 2001

7 "Saloniemi HS.Epidemiology of reproductive disorders in dairy cattle associations among host characteristics" 25-39,

8 "Risk factors for retained placenta and the effect of retained placenta on the occurrence of postpartum diseases and subsequent reproductive performance in dairycows" 6 : 53-59, 2005

9 "Risk factors for postpartum endometritis and the effect of endometritis on reproductive performance in dairy cows in Korea" 49 : 485-491, 2003

10 "Risk factors and the economic impact of ovarian cysts on reproductive performance of dairy cows in Korea" 51 : 491-498, 2005

11 "Relationship between heat stress during the peri-implantation period and early fetal loss in dairy cattle" 65 : 799-807, 2006

12 "Pregnancy loss in dairy cattle in the Waikato region of New Zealand" 53 : 279-287, 2005

13 "Noordhuizen JPTM. Associations between healthdisorders of French dairy cows and early and late cullingwithin the lactation. Prev Vet Med 1994" 213-231,

14 "Jameson CM. Considerationsfor use of descriptive epidemiology to investigate fetal loss indairy cows. J Am Vet Med Assoc 1990" 1305-1312,

15 "Influence of management factors onpregnancy attrition in dairy cattle" 45 : 1247-1253, 1996

16 "Genetic and environmental factors influencing first service conception rate and late embryonic/foetal mortality in low fertility dairy herds" 91 : 31-44, 2006

17 "Frost OL. A survey of theincidence of prenatal mortality in cattle following pregnancydiagnosis by rectal palpation. Theriogenology 1978" 481-491,

18 "Follicular wave emergence, luteal function and synchrony of ovulation following GnRH or estradiol benzoate in a CIDRtreated,lactating Holstein cows" 63 : 260-268, 2005

19 "Follicular size and response to Ovsynch versus detection of estrus in anovularand ovular lactating dairy cows" 86 : 3184-3194, 2003

20 "Fetal loss frequency in ten Holstein dairy herds" 45 : 1505-1513, 1996

21 "Factors affecting pregnancy loss from gestation Day 38 to 90 in lactating dairy cows from a single herd" 57 : 1251-1261, 2002

22 "Factors affecting conception rate after artificial insemination and pregnancy loss in lactating dairy cows" 84 : 239-255, 2004

23 "Extent, pattern and factors associated withlate embryonic loss in dairy cows" 71 : 1-12, 2002

24 "Evaluation of factors that affect embryonicloss in dairy cattle" 226 : 1112-1118, 2005

25 "Epidemiology of bovine abortions in Israeli dairy herds" 31 : 245-255, 1997

26 "Embryonic mortality and embryo-pathogen interactions" 131-143, 2000

27 "Effect of timing of first clinical mastitis occurrence on lactational and reproductive performance of Holstein dairy cows" 80 : 31-45, 2004

28 "Effect of disease on reproduction in the dairy cow: a meta-analysis" 53 : 1729-1759, 2000

29 "Dobson H. Periparturient diseases and theireffect on reproductive performance in five dairy herds. VetRec 1989" 217-219,

30 "Comparison of ultrasonography, bovine pregnancy-specificprotein B, and bovine pregnancy-associated glycoprotein 1tests for pregnancy detection in dairy cows" 50 : 77-88, 1998

31 "Committee on Bovine Reproductive Nomenclature.Recommendations for standardizing bovine reproductiveterms. Cornell Vet 1972" 216-237,

32 "An epidemiologic study of late-term abortions in dairy cattle in Denmark, July 2000- August 2003" 77 : 215-229, 2006

33 "An alternative AI breeding protocol for dairy cows exposed to elevated ambient temperatures before or after calving or both" 84 : 799-806, 2001

34 "Advancing parity is associated with high milk production at the cost of body condition and increased periparturient disorders in dairy herds" 7 : 161-166, 2006

35 "2003 Survey on livestock production cost in Korea" National Agricultural Products Inspection Office,Anyang 25-, 2004