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EFFECT OF POSTPARTUM UTERINE DISEASES ON MILK YIELD, MILK COMPONENTS, AND REPRODUCTION IN LACTATING DAIRY COWS UNDER CERTIFIED ORGANIC MANAGEMENT

Piñeiro, Juan Manuel
http://orcid.org/0000-0002-5212-3817
http://rave.ohiolink.edu/etdc/view?acc_num=osu1461166126

Abstract Details

2016, Master of Science, Ohio State University, Veterinary Preventive Medicine.
The objective of the present study was to assess the effect of postpartum uterine diseases on milk yield (kg/day), and milk components (percent fat and protein, and SCC). Lactating cows (n = 3,217) from 2 dairy herds were screened for retained placenta (RP; >24 hours after parturition), metritis (MET) within 20 days in milk (DIM), and clinical endometritis (CE) at 26 ± 3 DIM. Milk yield and components from the DHIA test-days up to 305 DIM and reproductive performance at first service were collected. Weekly, a list of cows was obtained using on-farm computer records screened for RP, MET, and CE. Parity (lactations 1, 2 and =3) of cows was accounted for milk yield, milk components, and reproduction. The statistical analyses were performed using MIXED (milk yield and components), GLIMMIX (risk factors associated with uterine diseases and reproduction), and CORR (correlation of risk factors with uterine diseases) procedures of SAS. Cows diagnosed with MET or CE had a negative effect on milk yield, increased milk fat percentage and SCC, and reduced reproductive performance at first service. Regardless of parity, lactating cows diagnosed with MET and CE had significantly reduced milk yield (by 2 to 3 kg/cow/day) for at least one of the first 4 DHIA tests (P < 0.05), but no difference was observed in subsequent tests. For the first 2 DHIA tests relative to calving, lactating cows diagnosed with MET and CE had significantly higher SCC and fat content compared with cows without MET and CE (P < 0.05). Milk protein content was not different between cows with or without uterine diseases. Cows with MET and CE had increased (P < 0.05) DIM to first service and significantly lower (P < 0.05) pregnancies to first service compared with cows without MET and CE, regardless of parity. In conclusion, uterine diseases (MET and CE) decreased milk yield and altered milk components (primarily SCC and fat) early in lactation; Furthermore, MET and CE were substantial risk factors for reduced reproductive performance in lactating dairy cows under certified organic management.
Gustavo Schuenemann (Advisor)
William Weiss (Committee Member)
Hans Bothe (Committee Member)
Santiago Bas (Committee Member)
81 p.
Agriculture
Dairy, Organic Management, Uterine Diseases, Milk Yield, Reproduction

Recommended Citations

Citations

  • Piñeiro, J. M. (2016). EFFECT OF POSTPARTUM UTERINE DISEASES ON MILK YIELD, MILK COMPONENTS, AND REPRODUCTION IN LACTATING DAIRY COWS UNDER CERTIFIED ORGANIC MANAGEMENT [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461166126

    APA Style (7th edition)

  • Piñeiro, Juan. EFFECT OF POSTPARTUM UTERINE DISEASES ON MILK YIELD, MILK COMPONENTS, AND REPRODUCTION IN LACTATING DAIRY COWS UNDER CERTIFIED ORGANIC MANAGEMENT. 2016. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1461166126.

    MLA Style (8th edition)

  • Piñeiro, Juan. "EFFECT OF POSTPARTUM UTERINE DISEASES ON MILK YIELD, MILK COMPONENTS, AND REPRODUCTION IN LACTATING DAIRY COWS UNDER CERTIFIED ORGANIC MANAGEMENT." Master's thesis, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1461166126

    Chicago Manual of Style (17th edition)

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This open access ETD is published by The Ohio State University and OhioLINK.