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Association of body condition with lameness in dairy cattle: a single-farm longitudinal study

Published online by Cambridge University Press:  14 May 2021

Michaela Kranepuhl
Affiliation:
Faculty of Life Sciences, Animal Husbandry and Ethology, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin, Berlin, Germany LVAT – Institute for Animal Breeding and Husbandry, Ruhlsdorf/Groß Kreutz, Germany
Detlef May
Affiliation:
LVAT – Institute for Animal Breeding and Husbandry, Ruhlsdorf/Groß Kreutz, Germany
Edna Hillmann
Affiliation:
Faculty of Life Sciences, Animal Husbandry and Ethology, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin, Berlin, Germany
Lorenz Gygax*
Affiliation:
Faculty of Life Sciences, Animal Husbandry and Ethology, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-Universität zu Berlin, Berlin, Germany
*
Author for correspondence: Lorenz Gygax, Email: [email protected]
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Abstract

This research communication describes the relationship between the occurrence of lameness and body condition score (BCS) in a sample of 288 cows from a single farm that were repeatedly scored in the course of 9 months while controlling for confounding variables. The relationship between BCS and lameness was evaluated using generalised linear mixed-effects models. It was found that the proportion of lame cows was higher with decreasing but also with increasing BCS, increased with lactation number and decreased with time since the last claw trimming. This is likely to reflect the importance of sufficient body condition in the prevention of lameness but also raises the question of the impact of overcondition on lameness and the influence of claw trimming events on the assessment of lameness. A stronger focus on BCS might allow improved management of lameness that is still one of the major problems in housed cows.

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation

Lameness is still one of the greatest challenges in the husbandry of dairy cows (Oehm et al., Reference Oehm, Knubben-Schweizer, Rieger and Stoll2019). It is highly relevant in respect to welfare due to the associated pain but also in respect to production (Oehm et al., Reference Oehm, Knubben-Schweizer, Rieger and Stoll2019). Previous studies found a relationship between an increased risk of lameness and low body condition score (BCS; Green et al., Reference Green, Huxley, Banks and Green2014, Westin et al., Reference Westin, Vaughan, de Passillé, DeVries, Pajor, Pellerin, Siegford, Witaifi, Vasseur and Rushen2016, Randall et al., Reference Randall, Green, Chagunda, Mason, Archer, Green and Huxley2015, Reference Randall, Green, Green, Chagunda, Mason, Archer and Huxley2018, Oehm et al., Reference Oehm, Knubben-Schweizer, Rieger and Stoll2019). There are also some indications that a very high BCS also coincides with lameness (Ristevski et al., Reference Ristevski, Toholj, Cincović, Boboš, Trojačanec, Stevančević and Ozren2017). On the whole, the aetiology of bovine lameness is poorly understood. As one contributing factor, cows may suffer from nutritional deficits due to the high energy demand in early lactation. This deficit may result in a reduction in thickness of the digital cushion, which can then no longer absorb the weight of the cow (Bicalho et al., Reference Bicalho, Machado and Caixeta2009; Green et al., Reference Green, Huxley, Banks and Green2014).

Other aspects of individual cows are also known to influence the risk of lameness, such as lactation stage or age (reflected by lactation number: Oehm et al., Reference Oehm, Knubben-Schweizer, Rieger and Stoll2019). A medical treatment for a cause other than lameness may additionally indicate a challenged immune system and, therefore, an increased risk for lameness (similar to heifers with a high first-calving age: Randall et al., Reference Randall, Green, Chagunda, Mason, Archer, Green and Huxley2015). In addition, the housing system or management factors can increase the risk of lameness. Uncomfortable lying areas (Dippel et al., Reference Dippel, Dolezal, Brenninkmeyer, Brinkmann, March, Knierim and Winckler2009), season (heat stress: Cook et al., Reference Cook, Mentink, Bennett and Burgi2007) or low social rank can increase standing time and accordingly the risk of lameness. However, it is unclear to what extent hard surfaces and pasturing increase and decrease the risk of lameness (Haufe et al., Reference Haufe, Gygax, Wechsler, Stauffacher and Friedli2012). Finally, improper claw trimming can also lead to lameness (Chapinal et al., Reference Chapinal, de Passillé and Rushen2010).

Here, we analysed the relationship between lameness and body condition score while controlling for lactation stage, lactation number, additional medical treatment, season, and time since last claw trimming in a one-farm longitudinal study.

Materials and methods

In this project, 288 German Holstein dairy cows from a single farm were followed from February to October 2019 when they were in milk. They were housed in free-stall pens when observed but spent some time on pasture when dry (non-seasonal calving). At the end of each month (except for March), all cows were scored by the first author for whether they were lame (lameness score >2 vs. score 1 and 2), and for their body condition (scale of 1 to 5 in quarter steps). These scorings were complemented with information on lactation stage (0 to 80, 81 to 160, ≥ 161 d), lactation number (low: 1, intermediate: 2–3, high: ≥ 4), medical treatment (yes-no), season (winter-spring, summer, fall), and time since the last claw trimming event (continuous in days). A total of 1544 observations, (mean ± sd) 5.36 ± 1.89 observations/cow, were included in the statistical analysis. We evaluated the data using a Bayesian generalised linear mixed-effects model. We considered lameness as the dichotomous outcome variable and used the other variables as fixed predictors, including their two-way interactions. The relationship with body condition score showed some non-linearity and was accordingly included as an additional squared term. Cow identity was used as the random effect. For a more detailed description of the housing system, the data collection, and the statistical evaluation see the Supplementary Material & Methods.

Results

In the current sample, the average prevalence of lameness at each monthly scoring was 19.1% (± 5.7SD; range 10.3–29.1%). Of all the 1544 observations used in the sample, 1249 (80.9%) were scored as 1–2 (618 and 631 cases with score 1 and 2, respectively) and considered lame for the current evaluation. In addition, 162 (10.5%) observations scored as 3, 113 (7.3%) as 4 and 20 (1.3%) as 5–6 in respect to lameness.

A higher proportion of cows with a low and somewhat less clearly with a high BCS were lame (Table 1; Fig. 1, top). The occurrence of lameness also increased with lactation number (Table 1; Fig. 1, middle). Finally, more cows were lame a short time after claw trimming (Table 1; Fig. 1, bottom).

Fig. 1. The probability of observing lameness in relation to the body condition score (top), lactation number (middle), and time since the last claw trimming (bottom). Middle: the violin-and boxplot indicates the proportion of observations with lameness for each cow. Otherwise, the violin- and boxplots represent the raw data from the single observations. Model estimates with 95% confidence intervals are shown by the thick and thin lines, respectively.

Table 1. Statistical information on the overall P-value of the full model (compared with an intercept only model) and the P-values from the single term deletions

Note: The continuous variables were normalised for this analysis and sum-contrasts were used for the factor variables.

Effects of season and the interaction of lactation number and the time since the last claw trimming did not seem well supported visually and are, therefore, not interpreted even with a P-value slightly below 0.05. We consider these low P-values as chance occurrences due to the relatively large number of P-values that were calculated (Table 1). In any case, they were indicating relationships that were much weaker compared to those described above (and shown in Fig. 1).

Discussion

In respect to our central question on the relationship of lameness and body condition score, we found that a low BCS was associated with a higher prevalence of lameness compared to moderate BCS score, supporting earlier studies (Schöpke et al., Reference Schöpke, Weidling, Pijl and Swalve2013; Green et al., Reference Green, Huxley, Banks and Green2014; Westin et al., Reference Westin, Vaughan, de Passillé, DeVries, Pajor, Pellerin, Siegford, Witaifi, Vasseur and Rushen2016; Randall et al., Reference Randall, Green, Chagunda, Mason, Archer, Green and Huxley2015, Reference Randall, Green, Green, Chagunda, Mason, Archer and Huxley2018; Oehm et al., Reference Oehm, Knubben-Schweizer, Rieger and Stoll2019). Whether thinness is a risk factor for lameness (Bicalho et al., Reference Bicalho, Machado and Caixeta2009) or whether lame cows cannot keep up their body condition (Norring et al., Reference Norring, Häggman, Simojoki, Tamminen, Winckler and Pastell2014) could not be differentiated in this study and would need a more frequent assessment of lameness and BCS in order to follow the temporal sequence of changes in BCS and lameness more closely. It has been hypothesised that a low BCS in early lactation may pose a specific risk factor for lameness (Bicalho et al., Reference Bicalho, Machado and Caixeta2009; Schöpke et al., Reference Schöpke, Weidling, Pijl and Swalve2013). This could not be supported in our sample because we did not find an interaction between BCS and lactation stage. Moreover, we could support that a moderately high BCS may also be associated with a higher prevalence of lameness (Schöpke et al., Reference Schöpke, Weidling, Pijl and Swalve2013; Ristevski et al., Reference Ristevski, Toholj, Cincović, Boboš, Trojačanec, Stevančević and Ozren2017). All in all, the association of lameness and BCS emphasised the usefulness of a regular BCS assessment as a management tool for potential prevention of lameness.

In addition, we found an increased prevalence of lameness with increasing lactation number, supporting previous studies (Dippel et al., Reference Dippel, Dolezal, Brenninkmeyer, Brinkmann, March, Knierim and Winckler2009; Schöpke et al., Reference Schöpke, Weidling, Pijl and Swalve2013; Oehm et al., Reference Oehm, Knubben-Schweizer, Rieger and Stoll2019). Yet, in comparison to earlier studies, the prevalence in our sample was rather low (Bicalho et al., Reference Bicalho, Machado and Caixeta2009). The effect of season with a low lameness prevalence in winter and a high prevalence in summer was only weakly supported statistically, but followed previous results (Cook et al., Reference Cook, Mentink, Bennett and Burgi2007). The increased prevalence of lameness shortly after claw trimming could be associated to an incorrect claw trimming process (Chapinal et al., Reference Chapinal, de Passillé and Rushen2010). This contrasts with the finding of a positive effect of claw trimming on lameness (Manske et al., Reference Manske, Hultgren and Bergsten2002). An alternative explanation for this temporal effect is that lame cows were treated more often and that, therefore, cows that had been treated due to lameness still showed some indications for lameness shortly after treatment. Finally, we did not find clear support for an effect of lactation stage, additional medical treatment nor season on the occurrence of lameness in our sample.

In conclusion and given the current analysis, the following aspects seem promising for follow up and testing: Apart from a low BCS, a high BCS also seems a risk factor for lameness. If indeed the load on the digital cushion caused the lameness, the higher weight at a high BCS would be a risk factor. Therefore, cows with a BCS even higher than observed in the current study could be investigated to understand the relevance of this risk. Moreover, cows may walk unevenly shortly after claw trimming, which may be perceived as weak to moderate lameness during scoring. This poses the question of whether cows just need to habituate to a new (and trimmed) claw conformation or whether this is associated with pain as with other causes of lameness.

Supplementary material

The supplementary material for this article can be found at https://doi.org/10.1017/S0022029921000297

Acknowledgements

We thank C. Franke for answering all questions relating to the herd management on the farm, M. Schären and B. Waurich for their patience with lameness and BCS-scoring instructions, as well as the reviewers for commenting and improving our manuscript.

References

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Figure 0

Fig. 1. The probability of observing lameness in relation to the body condition score (top), lactation number (middle), and time since the last claw trimming (bottom). Middle: the violin-and boxplot indicates the proportion of observations with lameness for each cow. Otherwise, the violin- and boxplots represent the raw data from the single observations. Model estimates with 95% confidence intervals are shown by the thick and thin lines, respectively.

Figure 1

Table 1. Statistical information on the overall P-value of the full model (compared with an intercept only model) and the P-values from the single term deletions

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