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Parenteral Zinc Supplementation Increases Pregnancy Rates in Beef Cows
J M Anchordoquy1,2, J P Anchordoquy1,2, E M Galarza1,2
1IGEVET - Instituto de Genética Veterinaria "Ing. Fernando N. Dulout" (UNLP-CONICET LA PLATA), Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, calle 60 y 118 s/n, CP 1900, La Plata, Buenos Aires, Argentina.
Biological Trace Element Research
|February 7, 2019
Summary
Parenteral zinc supplementation improved reproductive performance in beef cows. Supplementation increased follicle size, progesterone levels, and significantly boosted pregnancy rates in cows undergoing fixed-time artificial insemination (FTAI).
Area of Science:
- Veterinary Science
- Animal Reproduction
- Nutritional Physiology
Background:
- Zinc is essential for cattle reproductive health.
- Optimizing zinc levels can enhance fertility outcomes.
- Fixed-time artificial insemination (FTAI) protocols require precise physiological conditions for success.
Purpose of the Study:
- To investigate the impact of subcutaneous zinc (Zn) injection on reproductive parameters in beef cows during an FTAI protocol.
- To assess the effects of Zn supplementation on follicle and corpus luteum (CL) dynamics, hormone concentrations (estradiol and progesterone), and pregnancy rates.
- To evaluate changes in plasma copper (Cu) and alkaline phosphatase (ALP) activity.
Main Methods:
- Beef cows received a 400 mg subcutaneous Zn injection at the start of the FTAI protocol.
- Measurements included preovulatory follicle and CL size, plasma estradiol (E2) and progesterone (P4) concentrations, and pregnancy rates.
- Plasma Zn and Cu concentrations and ALP activity were monitored throughout the study.
Main Results:
- Zinc supplementation increased preovulatory follicle area and plasma P4 concentration.
- In Zn-deficient cows, Zn supplementation increased corpus luteum area.
- Pregnancy rates were significantly higher in Zn-supplemented cows (80.95%) compared to controls (51.61%).
Conclusions:
- Parenteral zinc supplementation at the initiation of FTAI protocols enhances reproductive efficiency in beef cows.
- Increased follicle size and progesterone levels contribute to improved pregnancy outcomes.
- Zinc supplementation is a viable strategy to improve fertility in cattle, particularly in Zn-adequate or deficient animals.
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