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Karlsson, Anna, 2009. Inverkan av foders växtöstrogener på fysiologiska processer hos produktions- och sällskapsdjur. First cycle, G2E. Uppsala: SLU, Dept. of Anatomy, Physiology and Biochemistry (until 231231)



Phytoestrogens are secondary metabolites produced by plants. Among the plants that make phytoestrogens are soya, red clover and some types of grass. The name phytoestrogen is a collective term for compounds such as genistein, daidzein, biochanin A and formononetin. These compounds are similar to oestradiol-17β in their chemical structure. Because of this similarity, they can attach to the same binding site as regular oestradiol-17β. These binding sites are receptors called alpha (ERα) and beta (ERβ). Phytoestrogen can cause certain problems when sheep graze on phytoestrogen rich grass. Sheep can get reproductive disorders such as producing fewer lambs or difficulty getting pregnant. Phytoestrogen like formononetin can however have positive effects. If grass contains low concentration of formononetin, we can see a clear weight gain in lambs. The same problem emerges in cow, when they are fed on red clover. Their reproductive disorders however, are slightly weaker than in sheep. One problem that can occur in cows fed on clover is silent heat because phytoestrogens are inhibiting the heat in some cows. Another problem associated with phytoestrogens is that they occur in milk in the form of equol. Soy is widely used in pet food because it is inexpensive and it is a rich source of protein. One effect that has been observed is an increase in total and free thyroxin (T4).

Main title:Inverkan av foders växtöstrogener på fysiologiska processer hos produktions- och sällskapsdjur
Authors:Karlsson, Anna
Supervisor:Madej, Andrzej
Examiner:Holm, Lena
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2009
Level and depth descriptor:First cycle, G2E
Student's programme affiliation:VY001 Agricultural Science Programme - Animal Science 270 HEC
Supervising department:(VH) > Dept. of Anatomy, Physiology and Biochemistry (until 231231)
Keywords:Växtöstrogener, Produktionsdjur, Sällskapsdjur
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Animal physiology - Nutrition
Animal physiology - Reproduction
Deposited On:25 Feb 2010 09:06
Metadata Last Modified:20 Apr 2012 14:11

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