Effects of clinical mastitis on reproductive and milk performance of Holstein cows in Morocco

Abstract

The aim of this study was to determine the influence of clinical mastitis and time of first mastitis occurrence on reproductive and milk performance of Holstein cows. Data were collected in a dairy farm from 2008 to 2012 on 1725 cows, among which 464 cows with mastitis. To determine the influence of clinical mastitis on reproductive and milk performance, models included fixed effects of parity, calving season, calving year, and group (cows with and with no mastitis). To determine the effect of time of 1st mastitis occurrence on reproductive performance, the mastitic cows group was further reclassified into three groups: prior to 60 days, between 60 and 90 days and greater than 90 days postpartum. For milk performance, the mastitic cows group was divided into two groups: before and after peak milk yield. Clinical mastitis had significant effects on calving to first AI interval, milk yield, and fat yield, but a non-significant effect on days open, number of inseminations per conception, and milk fat percentage. Mastitic cows had a calving to first AI interval 6.1 days longer and 549.6 kg milk and 20.4 kg fat per 305 days of lactation lower than those with no mastitis. Time of 1st mastitis occurrence did not have any significant effect on reproductive performance. Further, milk and fat yields of cows diseased before peak milk yield were 506 kg and 23.9 kg, respectively, lower than those of cows affected after peak milk yield. Extra attention needs to be paid to mastitis during the early postpartum period.

Prevalence and etiology of mastitis in dairy cattle in El Oro Province, Ecuador

“…In general agreement with this finding, the prevalence of SCM has been estimated to be 36.7% in Poland [ 54 ], 46.4% in Brazil [ 12 ], 48.8% in Tanzania [ 53 ] and 50.4% in Rwanda [ 34 ]. The prevalence of intramammary infection tends to differ greatly from farm to farm and country to country [ 10 , 11 , 14 , 29 , 56 ]. Discrepancies in the incidence of mastitis may be attributed to differences in animal breeds, management systems, and/or husbandry.…”

Influence of clinical mastitis and its treatment outcome on reproductive performance in crossbred cows: A retrospective study

“…[2] who reported an altered estrus interval in cows affected with mastitis. Later on, several researchers reported adverse effects of mastitis on reproduction based on retrospective data [3-6]. Higher incidence of embryonic loss or abortion in CM affected cows has also been reported [7,8].…”

Polymorphisms in the promoter region of the bovine lactoferrin gene influence milk somatic cell score and milk production traits in Chinese Holstein cows

“…The incidence rate of mastitis has been reported to be 25-60% worldwide (Ruegg. 2003;Sadeghi-Sefidmazgi et al, 2010;Boujenane et al, 2015;Elhaig and Selim, 2015), while China usually has a relatively higher rate (Zhou et al, 2013;Yang et al, 2015). Direct selection for resistance to clinical mastitis may be very difficult; however, indirect selection has been practiced widely, typically using indices like milk somatic cell score (SCS) as indicators of resistance to mastitis (Shook.…”