The Impact of Mastitis on Reproductive Parameters of Dairy Cows

Abstract

The aim of this study was to evaluate the occurrence of mastitis and its impact on the reproductive parameters in a herd of 180 dairy cows. Based on the herd records 127 cows of Slovak spotted cattle and their crosses with red Holstein were selected for study between 1—2 months after calving. The examination of the health status of the mammary glands consisted of: the clinical examination of the udder, the California mastitis test (CMT) supplemented by the collection of mixed milk samples, and the laboratory examination of bacterial pathogens causing the mastitis. In addition to the mam­mary investigation, reproduction indicators such as the length of the insemination interval, the service period, the intercalving period and the insemination index were also analyzed. The results of this study indicated: a high incidence of mastitis (41.6 %), especially latent (21.2 %), subclinical (15.7 %) and clinical (4.7 %) forms were most common in the herd. The most frequently isolated bacteria from the infected milk samples were: coagulase negative staphylococci (54.1 %), S. aureus (16.9 %), Streptococcus spp. (15.0 %), A. viridans (7.5 %) and Ent. faecalis (6.4 %). According to the available literature, the optimum values of the intercalving period were 365—400 days, the insemination interval 55—80 days, the insemination index 1.2—2 and the service period 60—110 days. In comparison, our results showed increased, unsatisfactory reproductive values in the group of dairy cows with clinical mastitis. While in healthy cows as well as in groups of cows with latent and subclinical mastitis, all of the reproductive indicators were within the optimal levels.

Influence of Mastitis on Resumption of Ovarian Activity and ‎postpartum Reproductive Measurements in Baladi Cows

“…The present results agreed with those reported by Miller et al (2001) and Villa-Arcilaa et al (2017), who found that the post-partum first service in dairy cows was higher (86, 94,days) in those cows with mastitis (clinical or subclinical) than (71, 84, days) in healthy cows. Similar trend was observed by Zigo et al (2019) who found that the first post-partum service was 61.5, 66, and 85 days in healthy cows, sub-clinical mastitis, and clinical mastitis in dairy cows, respectively. When compared to control cows, Jersey cows with clinical mastitis before first service had a 22.6 day increase in first service post-partum (Barker et al, 1998).…”

“…In addition, Khokon et al (2017) found that 47 to76%, cases was positive to California Mastitis Test (CMT) in dairy cows. Recently, Zigo et al (2019) recorded that percentage of subclinical mastitis cases was 15.7 %,but clinical forms was 4.7 % in dairy cows.…”

“…The current findings correspond with those found by Villa-Arcilaa et al (2017) who reported that in cows with subclinical mastitis the interval from calving-to-conception was longer (157, days) compared with healthy cows (119, days). The average days open ranged from 98 days in healthy cows to 105 days in subclinical mastitis and 121 days in clinical mastitis in dairy cows (Zigo et al, 2019). Subclinical mastitis in cows linked to changes in ovarian physiology and steroidogenesis may explain the longer time between parturition and conception (Sakumoto et al, 2003;Lavon et al, 2011).…”

“…Mastitis, whether clinical or subclinical, results in significant economic losses due to reduced milk production, low milk content, higher culling rates, and treatment costs (Cha et al, 2011;Ali et al, 2013 andDahl et al, 2018).There is a relationship between cows suffering from mastitis and the length of the period from calving until the first ovulation reported by (Lavon et al, 2010;Nguyen et al, 2011 andGindri et al, 2019). The interval from post-partum first service and days open was longer in mastitic cows (Villa-Arcilaa et al,2017;Bouamra et al, 2017 andZigo et al,2019).In addition, lower conception rate (28-36%) recorded in mastitic cows compared to (41-42%) in healthy cows (Mellado et al, 2018and Lavon et al, 2019. May be there are limited researches on the effect of mastitis on resumption of ovarian activity and postpartum reproductive measurements in Egyptian Baladi cows.…”

Macroscopical Anatomy and Radiographic Study of the Non-Lactating Udder of Adult Local Iraqi Cow (Bos taurus)

“…lobally, cattle breeds are given a greatest interest in the farmer's work due to their high milk production and recurrent pregnancy and producing calf (1). Local Iraqi cow breed is one of the most important animals because of considering of them as a main source of milk and meat production which are essential components of human nutrition.…”