The most effective way to prevent disease and protection of livestock is vaccination. Most animals experience stress during vaccination, which affects the development of their immunity to the vaccination (Sivajothi et al., 2018). Vaccination causes stress, classified as acute stress that helps prime the immune system and chronic stress that harms the humoral immune response (Zhang et al., 1999). Acute stress controls the immune system and improves animal vaccine reactions (Hughes et al., 2013). The humoral immune response to vaccines is known to inhibit chronic stress (Cohen et al., 2001). Vaccination causes macrophages, monocytes, and dendritic cells to generate powerful pro-inflammatory cytokines such as interleukin 1 (IL-1), IL-6, and tumour necrosis factor (TNF-); these pro-inflammatory cytokines may cause the liver to produce acute-phase proteins rapidly which may act on the hypothalamus to induce fever and malaise, and they may retard growth and lower feed efficiency of animals. Insufficiently high concentrations of these pro-inflammatory cytokines may induce hypoglycemia, reduce cardiac output, cause hypovolemic shock, and cause disseminated intravascular coagulation (Roth, 1985). The transient loss of milk production (Giovannini et al., 2004; Bergeron et al., 2008) and vaccination-associated animal stress (Morgemstem et al., 2020) are topics that have been well brainstormed among researchers. Although some research found no negative vaccination effects on milk production, other studies have found transient fever and post-vaccinal milk decline in dairy cattle (Musser and Anderson, 1996). Species- and breed-wise reduction in milk associated with vaccination has been studied, especially in cattle (Bergeron et al., 2008; Schulze et al., 2016; Abutarbush et al., 2016; Morgemstem et al., 2020); Holstein Friesian cattle (Scott et al., 2001); Deoni and Crossbred cattle (Krishnaswamy et al., 2021); sheep; and goat (Giovannini et al., 2004). Several studies reflect a decrease in milk yield after vaccination.The possible reason for the post-vaccinal milk drop is due to a transient fever that reduces milk production in some cows. The effects of vaccination on milk yield appear transient and cannot be seen on 305-day yields (Dhaliwal et al. 1996). However, according to Scott et al. (2001), lactating dairy cows experienced a significant mean temperature increase of 0.41°C one day after vaccination and experienced the most pronounced milk production drop after vaccination. Based on the forecasting of the post-vaccination milk decrease described in the literature, we chose a trial period in this investigation that lasted from 15 days before vaccination to 15 days after vaccination to find the total loss of milk for a temporary period after vaccination. According to Bosch et al. (1997), measuring the mean milk production over a long period would make it impossible to detect even significant short-term impacts if a longer period after immunization is chosen. To confirm the consistency of the milk production before vaccination and to prevent any misunderstandings regarding the beginning and end dates of the trial on the part of the farm workers who recorded the milk production, Bosch and coworkers chose to record the daily milk production for a longer period (spanning 15 days before and 15 days after vaccination). Musser et al. (1996) observed a loss of milk production between 0.6 and 1.8 kg/day/animal for three days following the administration of the Escherichia coli bacterin-toxoid vaccine to dairy cows, and they also reported that vaccinated cows also produced milk at a rate that was around 7% lower than that of controls. Krishnaswamy et al. (2021) investigated the short-term impact of FMD immunization on milk yield in Deoni and crossbred cows. They found that following vaccination, in terms of corrected milk yield, the Deoni cow saw a slight decrease of 90 g per day; however, in the crossbred cow, there was a 360 g decline from pre-vaccination milk yield. Thus, Deoni and crossbred cows that had received the FMD vaccine saw a brief, non-significant decrease in milk production. Scoot et al. (2001) noted a significant (P < 0.05) decline in milk production (-2.53 kg/d) one day following vaccination with a vaccine containing four killed viruses bovine herpesvirus-1 (BHV-1), bovine viral diarrhoea virus (BVDV), bovine respiratory syncytial virus (BRSV), and parainfluenza-3 virus (PI-3V)) in combination with a 5-way Leptospiralbacterin in North America for vaccinating the dairy animals. Bosch et al. (1997) also reported a similar result, and there was a slight but substantial (P < 0.05) decline in daily milk output of around 1.4 kg per cow. Like the present study, Schulze et al. (2016) found a decrease in daily milk production in vaccinated cows compared to non-vaccinated cows (26.8 ± 0.39 vs. 28.2 ± 0.44 kg) after phase I inactivated Coxiellaburnetii vaccine. Giovannini et al. (2004) also reported a 10.5 g per day reduction in milk production from the Bluetongue-vaccinated cows. Abutarbush et al. (2016) investigated the impact of the LSD (lumpy skin disease) vaccine on milk production and observed a 5.5–16% decrease in daily milk production. Vaccine C (cattle master gold FP 5) and Vaccine T (triangle 4 + type 2 BVD) were used in cows by Bergeron et al. (2008). After vaccination with BVD killed or with combined killed viruses of BVD Types 1 and 2, infectious bovine rhinotracheitis (IBR), bovine respiratory syncytial virus (BRSV), and parainfluenza-3 (PI3), they observed milk production losses of -1.83 and − 0.63 kg per day, respectively, compared to the control (saline, -0.02 kg per day), which were similar to our findings (Bergeron et al., 2008). Morgemstem et al. (2020) reported a 0.41 kg decrease in daily milk yield for five days after LSD vaccination. After receiving Mannheimia haemolytica sub-unit immunization, Armfelt et al. (2020) reported a 0.7 kg daily milk yield reduction for three days. During the 30 days after immunisation, with the exception of days 2 and 21, there is no apparent decrease in milk production in lactation groups 1, 2, and > 2, or overall (Morgenstern and Klement, 2020). The intramammary Escherichia coli J5 vaccine demonstrated that the milk yield of control cows significantly decreased (-7.7 kg) the day following the challenge, but the milk yield of vaccinated cows did not change (+ 0.5 kg) (P = 0.02). After that, there was a slight difference in milk production between vaccinated and control cows (Wilson et al., 2007). Bivalent modified-live vaccine against the bluetongue virus did not result in significant variations in milk yield between vaccinations and control (Monaco et al., 2004). A commercial polyvalent vaccine against mastitis or a herd-specific Staphylococcus aureus vaccine causes considerably less milk production and 305-day milk output in the vaccinated group than in the control group (Hamedy et al., 2016). By Angelova et al. (2018), cows vaccinated against LSD had daily milk production that was 27.79 kg before vaccination and 24.31 kg after vaccination (P < 0.001). A transient reduction in milk yield and increased body temperature after vaccination were reported by Scott et al. (2001), Bosh et al. (1997), Musser et al. (1996), and Bergeron and Elsener (2001). Scott et al. (2001) reported lower daily milk yield by up to 5 kg in cows with the highest milk production. The post-vaccinal effects of FMD vaccination in a herd of Jersey and Red Dane cows caused a slight reduction in milk output observed in the vaccinated cows, which continued from 4 to 5 days. The total loss in milk yield ranged from 4.25 to 8.5 percent, with an average daily loss of about 6.0 percent of the total yield (Kalita et al., 1983). The average milk production (mean ± SE) before and after FMD vaccination was 7.68 ± 0.28 and 7.07 ± 0.28 kg, respectively. The overall milk yield of the herd recovered to pre-vaccination levels by the sixth day following vaccination, with the greatest losses occurring on the first day after vaccination, with a mean of 0.58 ± 09 kg. Over the time period, an average cumulative output loss of 1.93 kg per animal was determined (Pramod et al., 2021). Various authors reported a decrease in milk yield after vaccination, which corroborated our study. The differences in findings between different authors in the quantum of decrease in milk yield after vaccination varied across the studies due to variations in the type of vaccine, breed, parity, stages of lactation, management, and environmental factors. The duration and magnitude of milk yield reduction depend on the type of vaccine (live or killed), including antigens, the type of adjuvant, production, and stage of lactation of the animal, as well as from environmental factors.