[1] NELSON C D,POWELL J L,PRICE D M,et al.Assessment of serum 25-hydroxyvitamin D concentrations of beef cows and calves across seasons and geographical locations[J].Journal of Animal Science,2016,94(9):3958-3965.

[2] 陈相辉.犊牛佝偻病的防治措施分析[J].中国动物保健,2017,19(6):14-15. CHEN X H.Analysis of prevention and control measures of calf rickets[J].China Animal Health,2017,19(6):14-15.(in Chinese)
[3] TAYLOR M S,KNOWLTON K F,MCGILLIARD M L,et al.Blood mineral,hormone,and osteocalcin responses of multiparous Jersey cows to an oral dose of 25-hydroxyvitamin D
3 or vitamin D
3 before parturition[J].Journal of Dairy Science,2008,91(6):2408-2416.

[4] NORMAN A W,HENRY H.1,25-dihydroxycholecalciferol-a hormonally active form of vitamin D[J].Recent Progress in Hormone Research,1974,30:431-480.
[5] TRECHSEL U,BONJOUR J P,FLEISCH H.Influence of dietary calcium,phosphorus,and vitamin D on the conversion of 25-hydroxyvitamin D
3 to 1,25-dihydroxyvitamin D
3 by kidney tubules of diphosphonate-treated quails[J].Calcified Tissue Research,1977,22(Suppl):461-462.
[6] 王海洲,曹金党,秦甜甜.25-羟基维生素D
3的生物学特性及其在生猪饲粮中的应用研究进展[J].养猪,2021(1):45-48. WANG H Z,CAO J D,QIN T T.Biological characteristics of 25 hydroxyvitamin D
3 and its application in pig diet[J].Swine Production,2021(1):45-48.(in Chinese)
[7] NELSON C D,LIPPOLIS J D,REINHARDT T A,et al.Vitamin D status of dairy cattle:outcomes of current practices in the dairy industry[J].Journal of Dairy Science,2016,99(12):10150-10160.

[8] XU H J,WANG L H,ZHANG Q Y,et al.Effects of 25-hydroxyvitamin D
3 on growth performance,fecal scores,vitamin D
3 metabolites,antioxidant status,and inflammatory and stress-related parameters in weaning calves[J/OL].Animal Feed Science and Technology,2021:114946.(2021-04-22)[2021-05-12].https://www.sciencedirect.com/science/article/abs/pii/S0377840121001322.DOI:10.1016/j.anifeedsci.2021.114946.
[9] BAR A,SHARVIT M,NOFF D,et al.Absorption and excretion of cholecalciferol and of 25-hydroxycholecalciferol and metabolites in birds[J].The Journal of Nutrition,1980,110(10):1930-1934.

[10] YANG J W,TIAN G,CHEN D W,et al.Dietary 25-hydroxyvitamin D
3 supplementation alleviates porcine epidemic diarrhea virus infection by improving intestinal structure and immune response in weaned pigs[J].Animals,2019,9(9):627.
[11] 廖波,张克英,丁雪梅,等.饲粮添加25-羟基维生素D
3对轮状病毒攻毒和未攻毒断奶仔猪血清和肠内容物抗体和细胞因子水平的影响[J].动物营养学报,2011,23(1):34-42. LIAO B,ZHANG K Y,DING X M,et al.Effects of dietary supplementation with 25-OH-D
3 on antibody and cytokine levels in serum and intestinal contents of weanling pigs with or without rotavirus challenge[J].Chinese Journal of Animal Nutrition,2011,23(1):34-42.(in Chinese)
[12] 张艳梅.羟基-D
3的生理功能和机理研究[J].山西农业科学,2006,34(2):76-78. ZHANG Y M.Physiological function and mechanism of OH-D
3[J].Journal of Shanxi Agricultural Sciences,2006,34(2):76-78.(in Chinese)
[13] AOAC.Official methods of analysis[M].Washington D.C.:Association of Official Analytical Chemists,1984:152-169.
[14] VAN SOEST P J,ROBERTSON J B,LEWIS B A.Methods for dietary fiber,neutral detergent fiber,and nonstarch polysaccharides in relation to animal nutrition[J].Journal of Dairy Science,1991,74(10):3583-3597.

[15] FRITTS C A,WALDROUP P W.Effect of source and level of vitamin D on live performance and bone development in growing broilers[J].Journal of Applied Poultry Research,2003,12(1):45-52.

[16] MAALOUF N M.The noncalciotropic actions of vitamin D:recent clinical developments[J].Current Opinion in Nephrology and Hypertension,2008,17(4):408-415.

[17] MITCHELL R D,EDWARDS H M,Jr,MCDANIEL G R.The effects of ultraviolet light and cholecalciferol and its metabolites on the development of leg abnormalities in chickens genetically selected for a high and low incidence of tibial dyschondroplasia[J].Poultry Science,1997,76(2):346-354.

[18] CELI P,WILLIAMS S,ENGSTROM M,et al.Safety evaluation of dietary levels of 25-hydroxyvitamin D
3 in growing calves[J].Food and Chemical Toxicology,2018,111:641-649.
[19] NONNECKE B J,MCGILL J L,RIDPATH J F,et al.Acute phase response elicited by experimental bovine diarrhea virus (BVDV) infection is associated with decreased vitamin D and E status of vitamin-replete preruminant calves[J].Journal of Dairy Science,2014,97(9):5566-5579.

[20] DUFFY S K,KELLY A K,RAJAURIA G,et al.The effect of 25-hydroxyvitamin D
3 and phytase inclusion on pig performance,bone parameters and pork quality in finisher pigs[J].Journal of Animal Physiology and Animal Nutrition,2018,102(5):1296-1305.

[21] ADHIKARI R,WHITE D,HOUSE J D,et al.Effects of additional dosage of vitamin D
3,vitamin D
2,and 25-hydroxyvitamin D
3 on calcium and phosphorus utilization,egg quality and bone mineralization in laying hens[J].Poultry Science,2020,99(1):364-373.

[22] BECHDEL S I,HILSTON N W,GUERRANT N B.The vitamin D requirement (U.S.P Units) for growth and well-being of calves from birth to six months of age[J].Journal of Dairy Science,1937,20(7):434-435.
[23] LITTLEDIKE E T,HORST R L.Vitamin D
3 toxicity in dairy cows[J].Journal of Dairy Science,1982,65(5):749-759.

[24] HORST R L,GOFF J P,REINHARDT T A.Calcium and vitamin D metabolism in the dairy cow[J].Journal of Dairy Science,1994,77(7):1936-1951.

[25] XU H J,JIANG X,ZHANG C R,et al.Effects of dietary 25-hydroxyvitamin D
3 on the lactation performance,blood metabolites,antioxidant and immune function in dairy cows[J].Livestock Science,2021,248:104497.
[26] VON ROSENBERG S J,WEBER G M,ERHARDT A,et al.Tolerance evaluation of overdosed dietary levels of 25-hydroxyvitamin D
3 in growing piglets[J].Journal of Animal Physiology and Animal Nutrition,2016,100(2):371-380.

[27] YANG J W,TIAN G,CHEN D W,et al.Effects of dietary 25-hydroxyvitamin D
3 supplementation on growth performance,immune function and antioxidative capacity in weaned piglets[J].Archives of Animal Nutrition,2019,73(1):44-51.

[28] FRANCESCHI R T,YOUNG J.Regulation of alkaline phosphatase by 1,25-dihydroxyvitamin D
3 and ascorbic acid in bone-derived cells[J].Journal of Bone and Mineral Research,2009,5(11):1157-1167.

[29] 黄伟,夏明月,李明丽,等.急性腹泻患儿血清25-羟维生素D与炎性细胞因子水平的关系[J].山东医药,2017,57(10):58-59. HUANG W,XIA M Y,LI M L,et al.Relationship between serum 25-hydroxyvitamin D and levels of inflammatory cytokines in children with acute diarrhea[J].Shandong Medical Journal,2017,57(10):58-59.(in Chinese)
[30] MVLLER K,ODUM N,BENDTZEN K.1,25-dihydroxyvitamin D
3 selectively reduces interleukin-2 levels and proliferation of human T cell lines
in vitro[J].Immunology Letters,1993,35(2):177-182.

[31] KIM H S,WHON T W,SUNG H,et al.Longitudinal evaluation of fecal microbiota transplantation for ameliorating calf diarrhea and improving growth performance[J].Nature Communications,2021,12(1):161.
[32] 王新华,张星星,王立民,等.转
IGF-1基因超细毛羊与非转基因羊肠道粪便菌群多样性及组成差异分析[J].畜牧兽医学报,2020,51(10):2387-2402. WANG X H,ZHANG X X,WANG L M,et al.Differences of the intestinal microbial flora diversity and composition in
IGF-1 transgenic superfine wool sheep and non-transgenic sheep[J].Acta Veterinaria et Zootechnica Sinica,2020,51(10):2387-2402.(in Chinese)