Dairy Cows Are Limited in Their Ability to Increase Glucose Availability for Immune Function during Disease

Abstract

Shortages of energy and glucose have been hypothesized to play a key role in the development of and responses to production diseases in dairy cows during early lactation. Given the importance of glucose for immune functions, we used a recently established method for the estimation of glucose balance (GB) to evaluate glucose availability during disease phases. A dataset comprising ration analyses as well as individual daily milk yields (MY), dry matter intake (DMI), body weights, and health records of 417 lactations (298 cows) was used to calculate individual daily GB and energy balance (EB). The magnitude and dynamics of MY, DMI, GB, and EB were evaluated in the weeks before, at, and after diagnoses of inflammatory diseases in different stages of early lactation from week in milk 1 to 15. Diagnoses were categorized as mastitis, claw and leg diseases, and other inflammatory diseases. Mixed linear models with a random intercept and slope term for each lactation were used to evaluate the effect of diagnosis on MY, DMI, GB, and EB while accounting for the background effects of week in milk, parity, season, and year. When unaffected by disease, in general, the GB of cows was close to zero in the first weeks of lactation and increased as lactation progressed. Weekly means of EB were negative throughout all lactation stages investigated. Disease decreased both the input of glucose precursors due to a reduced DMI as well as the output of glucose via milk due to a reduced MY. On average, the decrease in DMI was −1.5 (−1.9 to −1.1) kg and was proportionally higher than the decrease in MY, which averaged −1.0 (−1.4 to −0.6) kg. Mastitis reduced yield less than claw and leg disease or other diseases. On average, GB and EB were reduced by −3.8 (−5.6 to −2.1) mol C and −7.5 (−10.2 to −4.9) MJ in the week of diagnosis. This indicates the need to investigate strategies to increase the availability of glucogenic carbon for immune function during disease in dairy cows.

Comparison of Two Methods for the Measurement of Blood Plasma and Capillary Blood Glucose in Tropical Highland Grassing Dairy Cows

“…These cows may have displayed a physiological insulin resistance state, such as that previously hypothesized by Holtenius and Holtenius [21]. However, it seems to be that glucose is an insensitive indicator of energy status in cattle due to its homeostatic control [22][23][24][25]. In line with this, additional research is necessary to establish cut-off values for glycemia status classification in our environmental conditions [22,26].…”

Why has animal science not led to improved farm animal health and welfare?

“…In the case of dairy cows, large inter-and intraindividual variation refers not only to the nutrient requirements but also to the intake and the disposability of nutrients as exemplified in the case of dairy cows (Rumphorst et al, 2022;Habel and Sundrum, 2023). Correspondingly, an indifferent nutrient supply to a feeding group of cows as in the case of a total mixed ration inevitably leads to a situation where a relevant part of the animals is either undersupplied or overfed, whereas only the minority of individual is fed closely according to their daily requirements.…”