NUR HAFIDZAH DEVI KARTIKA 990

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REPRODUCTION HORMONES

COURSE: ANIMAL REPRODUCTION SCIENCES

by Nur Hafidzah Devi Kartika, S.Pt., M.Pt.

[email protected]

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Review: Livestock Reproductive Organ

• Anatomy of Female Reproduction

• Physiology of Female Reproduction

Last Week Meeting

Bulls

Female Cattle

https://quizizz.com/join?

gc=65868864

• Anatomy of Male Reproduction

• Physiology of Male Reproduction

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Endocrine Glands Hormon Definition

Cattle Reproduction Hormon

TOPIC

Case Study  Problem Solving

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Learning Outcomes

Students are able to explain the

definition and regulation of reproductive hormone.

Students are able to develop the

reproductive optimization by understand the hormonal phase.

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Definition of Hormones

Chemical Messengers

Hormones are chemical messengers produced by glands in the body that regulate various

physiological functions.

Target Tissues

Hormones travel through the bloodstream and bind to specific target tissues to

elicit a response.

Regulation

Hormone production and release are tightly regulated by feedback mechanisms, ensuring optimal function.

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Groups of Hormones

1

^Proteins

Polypeptide hormones ranging from a molecular

weight of 300 up to 70.000 daltons, eg: oxytocin, FSH and LH.

2

^Steroids

Cholesterol derived and have molecular weight of 300 to 400 daltons, eg: testosterone.

3

Fatty Acids

Amines

4

Arachidonic acid derived and have a molecular weight of about 400 daltons.

Tyrosine and Tryptophan derived, eg: melatonine.

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Endocrine Glands

1

Hypothalamus

2

Pituitary Gland

Gonads

3

Source: Hafez and Hafez, 2000

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Hormonal Regulation of Bulls

Folicle Stimulating Hormone

Stage 2: Meiosis

Spermatocytes undergo meiosis, reducing the chromosome number by half.

Stage 3: Spermiogenesis

GnRH

Source: Hafez and Hafez, 2000

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Hormonal Regulation of Female Cattle

Hormone Name Abbreviation Role in Estrous Cycle

Follicle stimulating Hormone FSH Recruitment of the group of small follicles from the pool of growing follicles on each ovary.

Luteinizing Hormone LH A preovulatory surge of LH results in the ovulation of the ovulatory follicle.

Progesterone P4 Inhibits ovulation.

Estrogen E2 Elevated concentrations in the absence of

progesterone cause behavioral changes

associated with standing estrus and cause the release of a surge GnRH.

Prostaglandin PG Induces the destruction of the CL.

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HIPOFISA

GnRH

Uterus

Contraction OKSITOSIN NEUROHIPOFISA ADENOHIPOFISA

FSH LH

Ovulation Stimulate follicle growth

RELAXIN LTH/

PROLAKTIN

Milk Secretion Uterus

relaxation ESTROGEN Estrous

HIPOTALAMUS

Stimulatio n

Hormonal Mechanism of Bovine

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Case Study

Dairy farmers face

challenges related to

irregular estrous cycles and delayed conception in their cattle. Indentify the

factors that influencing

those case.

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Case Study  Problem Solving

Those Case Influenced by:

1. Genetic 2. Nutrition

3. Body Condition Scores

4. Environmental Factors

5. Management Practices

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Conclusion

Understanding the role of hormones in livestock reproduction is crucial for optimizing animal health, manage breeding programs and production.

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Group Assignment

Research Paper

Reseach sexual maturity of cattle, ewe, rams, sows, boars, and birds.

Presentation

Prepare a report of 5 page maximum and brief

presentation on your findings for the next class.

Submit on Google Classroom December 5^th, 2024

Sexual

Maturity

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References

 Hafez, B. dan E,S.E. Hafez. 2000. Reproduction in Farm Animals. Lippincot Williams and Wilkins, Philadelphia.

 Arthur, G..E., D.E. Noakes and H. Pearson, 1982, Veterinary Reproduction and Obstetrics, 5th edition, The English Language Book Society and BailliereTindall, London.

 Li, lu., W. Lin., Z. Wang., R. Huang., H. Xia., Z. Li., J. Deng., T.

Ye., Y. Huang and Y. Yang. 2024. Hormone Regulation in Testicular Development and Fuction. J. Molecular Sciences.

25, 1-25.

 Garverick, A. H and M. F. Smith. 1993. Female Reproductive Physyology and Endocronology of Cattle. J. Female Bovine Infertility.9 (2): 223-248.

 Crowe, A. A and M. P. Mullen. 2013. Regulation and Function of Gonadotropins Throughout the Bovine Oestrous Cycle.

doi:10.5772/53870

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THANKYOU

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