López-Gatius Fernando, Ganau Sergi, Mora-García María, Garcia-Ispierto Irina
Agrotecnio Centre, 25198 Lleida, Spain.
Transfer in Bovine Reproduction SLu, 22300 Barbastro, Spain.
Animals (Basel). 2024 Dec 6;14(23):3534. doi: 10.3390/ani14233534.
Coccidiosis is a protozoan disease that causes diarrhea in cattle. This study examines the impact of treating pregnant cows at dry-off with melatonin on postpartum coccidia excretion in dams and their calves. The study population comprised 106 primiparous lactating dairy cows: 53 controls and 53 receiving melatonin on days 220-226 of gestation, plus 99 calves: 52 born from control and 47 from treated dams. Feces samples were collected from each dam on gestation days 220-226 and on days 10-16 and 30-36 postpartum; and from each calf on days 10-16 and 30-36 of age. Postpartum rates of high excretion of oocysts per gram (OPG) (feces counts > 5000) were significantly lower ( < 0.01) in treated than control dams. Low excretion rates of OPG (<2000) were significantly higher ( < 0.01) in the melatonin treatment than control groups in dams on days 30-36 of lactation and in calves at 10-16 and 30-36 days of life. In conclusion, melatonin treatment in lactating cows at dry-off reduced coccidia shedding in dams and their calves during the early postpartum period.
球虫病是一种导致牛腹泻的原生动物疾病。本研究考察了在干奶期给怀孕母牛注射褪黑素对产后母畜及其犊牛球虫排泄的影响。研究群体包括106头初产泌乳奶牛：53头作为对照，53头在妊娠第220 - 226天接受褪黑素注射，外加99头犊牛：52头出生于对照母牛，47头出生于接受治疗的母牛。在妊娠第220 - 226天、产后第10 - 16天和第30 - 36天收集每头母畜的粪便样本；在犊牛10 - 16日龄和30 - 36日龄时收集粪便样本。治疗组母畜产后每克粪便中卵囊高排泄率（粪便计数>5000）显著低于（<0.01）对照组。在泌乳第30 - 36天的母畜以及10 - 16日龄和30 - 36日龄的犊牛中，褪黑素治疗组的低排泄率（<2000）显著高于（<0.01）对照组。总之，在干奶期给泌乳母牛注射褪黑素可减少产后早期母畜及其犊牛的球虫排出。
