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Effects of dietary supplementation of selenium + iodine on growth performance, carcass characteristics + histology of thyroid gland in goats

Yes, goats. Japanese goats! [ Edit: Probably not Japanese but Malaysian, etc. ]

Nonetheless in my ongoing stream of varied posts, this does have its own interest.

Anim Sci J. 2015 Nov 11. doi: 10.1111/asj.12484. [Epub ahead of print]

Effects of dietary supplementation of selenium and iodine on growth performance, carcass characteristics and histology of thyroid gland in goats.

Aghwan ZA1,2, Sazili AQ1,3,4, Kadhim KK5, Alimon AR3, Goh YM6,4, Adeyemi KD3,7.

Author information

1Halal Products Research Institute, Serdang, Selangor Darul Ehsan, Malaysia.

2Department of Animal Science, College of Agriculture, University of Mosul, Mosul, Iraq.

3Department of Animal Science, Faculty of Agriculture, Serdang, Selangor Darul Ehsan, Malaysia.

4Laboratory of Animal Production, Institute of Tropical Agriculture, Universiti Putra Malaysia, UPM Serdang, Selangor Darul Ehsan, Malaysia.

5Branch of Anatomy and Histology, College of Veterinary Medicine, University of Baghdad, Baghdad, Iraq.

6Department of Veterinary Preclinical Sciences, Faculty of Veterinary Medicine.

7Department of Animal Production, University of Ilorin, Ilorin, Nigeria.


This study assessed the effects of dietary selenium (Se), iodine (I) and a combination of both on growth performance, thyroid gland activity, carcass characteristics and the concentration of iodine and selenium in Longissimus lumborum (LL) muscle in goats. Twenty-four bucks were randomly assigned to four dietary treatments: control (CON), basal diet without supplementation, basal diet + 0.6 mg Se/kg dry matter (DM) (SS), 0.6 mg I/kg DM (IP), or combination of 0.6 mg/kg DM Se and 0.6 mg/kg DM I (SSIP) and fed for 100 days. Animals fed diet SSIP exhibited higher (P < 0.05) body weight and better feed conversion ratio (FCR) than those fed other diets. Dressing percentage of goats fed the supplemented diets was higher (P < 0.05) than that of the control. Carcasses from the IP group had higher (P < 0.05) total fat proportion than the SSIP group. The levels of both elements were significantly elevated (P < 0.05) in LL muscle in supplemented goats. Thyroid follicular epithelial cells of IP and SSIP animals were significantly higher than those of CON and SS groups. The study demonstrated that the combined Se and I dietary supplementation improves growth performance, carcass dressing percentage and increases the retention of Se and I in goat meat.

© 2015 Japanese Society of Animal Science.


goat meat; growth; iodine; selenium; thyroid gland

6 Replies

I don't know about growth performance, carcass dressing percentage and the retention of Se and I in goat meat but do know that iodine & selenium ( along with zinc and iron) has positive effects on thyroid function in certain conditions....



Makes me question how much the animal husbandry industry (including vets) is aware of the ongoing impact of these substances on us - the ultimate consumers.

Lots of thoughts but no conclusions...


What about these goats? When supplemented with both Se and I, did they achieve optimal size etc.? What is optimal for these goats? I wouldn't take a study like this out of context.

Over here animals must get supplemental Se and I or they will die since the grass and whatnot is negligible in both.

Probably supplementary minerals are not randomly applied.

What about chicken? Besides antibiotics, what else do they get? Minerals? Iodine, selenium and vitamins? 8 weeks to slaughter. If that's not gross, what is?


Apparently, selenium levels in UK eggs have increased over the past decade or two.

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Judging by the goats round here I don't think their LL muscles are optimal :-)

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Very interesting , we have a sheep farm . We blood test several ewes and see what they are low in and give a suitable drench if needed . It it very expensive though . This time we gave them a slow release bolus ! . Quite a few farmers put minerals out in buckets and I've found over the years the ewes seem to only go to eat them if needed . They get all they need from the grass unless it's hill grass which is poorer nutritional value . The use of antibiotics is strict , every time we inject a sheep we have to right down its tag number , how much it was given , the batch number of antibiotic and the withdrawal . The books are checked regularly by tradimg standards and you are in trouble if they are wrong. No animal is sold if it is not out of the withdrawal period .

Selenium is ver important prior to lambing mainly because if the sheep is low in it the lamb is very weak and can die . We call it white muscle disease , sometimes if your quick enough and inject with selenium it can survive .

Goodness I could go forever lol but thankyou for the post ,,, it's sad but me and my husband have "words" about giving the ewes minerals , him wanting to give them ,,, me thinking of the costs !

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