2,000 IU of Vitamin D per kg of food – best growth, bone strength, etc. (pig trial) – Dec 2022

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Effects of 25(OH)VD3 on Growth Performance, Pork Quality and Calcium Deposit in Growing-Finishing Pigs

Animals (Basel) . 2022 Dec 26;13(1):86. doi: 10.3390/ani13010086.
Zeyu Zhang 1, Gang Zhang 1, Jindang Cao 2, Baoqin Qiu 2, Xiaoyu Qin 2, Jinbiao Zhao 1

The study was conducted to evaluate the effects of 25(OH)VD3 with different inclusion levels of 0, 25, 50 and 75 µg/kg in the diet on growth performance, nutrient digestibility, bone properties and pork quality in growing-finishing pigs. The results showed that the average daily gain (p < 0.05) and body weight (p < 0.10) of pigs showed a trend of increasing quadratically as inclusion levels of 25(OH)VD3 increased.
Dietary supplementation of 50 µg/kg 25(OH)VD3 increased calcium digestibility compared with the 0 µg/kg group (p <; 0.05), and calcium and phosphorus digestibility increased quadratically as inclusion levels of 25(OH)VD3 increased (p < 0.05). Dietary supplementation of 50 µg/kg 25(OH)VD3 increased concentrations of polyunsaturated fatty acids, and decreased contents of saturated and monounsaturated fatty acids in the longissimus dorsi of pigs (p < 0.05).
The addition of 25, 50 and 75 µg/kg 25(OH)VD3 to the diet increased breaking strength and bone stiffness in the tibia compared with the 0 µg/kg group (p < 0.05). Dietary supplementation of 50 µg/kg 25(OH)VD3 improved the activities of superoxide dismutase (SOD) and catalase (CAT), and increased the messenger RNA (mRNA) expression of Cu/Zn SOD in the longissimus dorsi compared with the 0 µg/kg group (p < 0.05). Supplementing 50 µg/kg 25(OH)VD3 improved the mRNA expression of calcium-binding protein D9k (CaBP-D9k) and D28k (CaBP-D28K) in the liver compared with the 0 µg/kg 25(OH)D3 group (p < 0.05). In conclusion, a diet with an added dose of 50 µg/kg 25(OH)VD3 showed a greatest growth performance of growing-finishing pigs, and 25(OH)VD3 enhanced calcium deposition and antioxidant capacity in the longissimus dorsi, which may be associated with improved expression of calcium ion channel proteins.
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VitaminDWiki - Overview Veterinary and vitamin D contains

Veterinary category has 154 items

Animals need Vitamin D too

• Vitamin D is important for pregnancies (pigs as well as people)– Sept 2022
• Many Vitamin D similarities: people and cows - March 2022
• Several advanced-maternal-age problems reduced if given Vitamin D during pregnancy (mice in this case) – July 2021
• Poor immune system associated with low Vitamin D (dogs in this case) – June 2020
• Chicken bones, eggs, and activated vitamin D in eggs increased with 2 hours of daily UVB – Dec 2019
• Vitamin D in eggs increased 4X after UV lighting near legs was added – April 2019
• Hens with Vitamin D were better in at least 5 ways – RCT Aug 2018

Pets as well

• Critically ill dogs with good levels of vitamin D have much better outcomes (humans too) – March 2018
• Half of dogs now get cancer, it used to be just 1 percent (probably low Vitamin D)
• Dogs, cats, rabbits, guinea pigs, pet birds, etc need Vitamin D
• Dogs with Cancer have low vitamin D, same as humans – Sept 2017
• Companion animals (dog, cats) need vitamin D too – March 2016
• Hospitalized cats 8X more likely to die if low vitamin D (Vit. D helps humans too) – May 2015
• Rickets increasing in dogs

Farm Vets are paid when their "patients" are healthy,
   vs doctors who are paid only when "patients" become sick
Cows are routinely given 30 IU per kilogram (which would be 10,000 IU for a 150 lb person)
Same information is available on Cattle need 66 IU of vitamin D per pound
The US RDA of vitamin D for cows is 13 IU per kilogram (which would be 4,300 IU for a 150 lb 'cow')
Virtually all US farmers who raise livestock use feed that is supplemented with vitamin D
Merick Vet Manual supplement if not have UV or sunlight

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VitaminDWiki - Fatty acid chart

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