Chronic subclinical mastitis reduces milk and components yield at the cow level

2020 ◽  
Vol 87 (3) ◽  
pp. 298-305 ◽  
Author(s):  
Larissa Martins ◽  
Melina Melo Barcelos ◽  
Roger I. Cue ◽  
Kevin L. Anderson ◽  
Marcos Veiga dos Santos ◽  
...  
Keyword(s):  
Milk Yield ◽  
Positive Culture ◽  
Subclinical Mastitis ◽  
Milk Composition ◽  
Udder Health ◽  
Grand Total ◽  
Three Samples ◽  
Milk Component ◽  
Major Pathogens

AbstractWe evaluated the effects of chronic subclinical mastitis (CSM) caused by different types of pathogens on milk yield and milk components at the cow level. A total of 388 Holstein cows had milk yield measured and were milk sampled three times at intervals of two weeks for determination of SCC and milk composition, and microbiological culture was performed. Cows were considered healthy if all three samples of SCC were ≤200 000 cells/ml and were culture-negative at the third milk sampling. Cows with one result of SCC > 200 000 cells/ml were considered to suffer non-chronic subclinical mastitis whereas cows with at least 2 out of 3 results of SCC > 200 000 cells/ml had CSM. These latter cows were further sorted according to culture results into chronic negative-culture or chronic positive-culture. This resulted in four udder health statuses: healthy, non-chronic, chronicNC or chronicPC. The milk and components yields were evaluated according to the udder health status and by pathogen using a linear mixed effects model. A total of 134 out of 388 cows (34.5%) were chronicPC, 57 cows (14.7%) were chronicNC, 78 cows (20.1%) were non-chronic and 119 cows (30.7%) were considered healthy, which resulted in a grand total of 1164 cow records included in the statistical model. The healthy cows produced more milk than each of the other groups (+2.1 to +5.7 kg/cow/day) and produced higher milk component yields than the chronicPC cows. The healthy cows produced more milk than cows with chronicPC caused by minor (+5.2 kg/cow/day) and major pathogens (+7.1 kg/cow/day) and losses varied from 5.8 to 11.8 kg/cow/day depending on the pathogen causing chronicPC mastitis. Chronic positive-culture cows had a reduction of at least 24.5% of milk yield and 22.4% of total solids yield.

Effects of dietary supplements of zinc-methionine on milk production, udder health and zinc metabolism in dairy goats

2003 ◽  
Vol 70 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Ahmed AK Salama ◽  
Gerardo Caja ◽  
Elena Albanell ◽  
Xavier Such ◽  
Ramón Casals ◽  
...  
Keyword(s):  
Milk Yield ◽  
Milk Composition ◽  
Barley Grain ◽  
Zinc Metabolism ◽  
Dairy Goats ◽  
Protein Nitrogen ◽  
Udder Health ◽  
Concentrate Mixture ◽  
True Protein ◽  
Organic Zn

Twenty-two Murciano-Granadina dairy goats were used to investigate the effects of organic Zn supplementation of a diet containing a high level of inorganic Zn. Goats were kept in pens, machine milked once a day throughout lactation and fed a diet based on a dehydrated mixture of whole-plant maize and alfalfa ad libitum, alfalfa pellets, barley grain and a concentrate mixture. Treatments were: (1) control, and (2) supplemented with 1 g/d Zn-Methionine (Zn-Met) included in the concentrate mixture. After parturition, goats were blocked in week 3 and dietary treatments were applied until week 23. From weeks 3–20, feed intake, milk yield, milk composition, milk somatic cell count (SCC), and udder health were measured. In week 21, all goats were injected intraperitoneally with 1 g/d DL-methionine for 5 d to establish the effects of methionine under the conditions of udder stress induced by hand milking on the second day. During weeks 22 and 23, diet digestibility, and N and Zn balance were determined. Dry matter intake, milk yield, and milk contents of total solids, fat, total and true protein, and casein did not differ between treatments, but whey protein and non-protein nitrogen contents were significantly lower for the Zn-Met group. Milk SCC tended to decrease as a result of Zn-Met supplementation but differences between treatments were not significant when halves with persistent infection were excluded. Hand milking increased SCC in both groups, but udders of supplemented goats showed a lower reaction. Apparent absorption of N significantly increased and Zn retention tended to increase in Zn-Met supplemented goats. We conclude that Zn-Met supplementation can enhance resistance to udder stress in dairy goats. Effects were attributed to the organic Zn and not to the methionine component. Zn retention and protein utilization were also improved by the Zn-Met supplement.

scholarly journals Effect of subclinical mastitis on milk yield and milk composition parameters in dairy camels

2020 ◽  
Vol 63 (2) ◽  
pp. 83-90
Author(s):  
Leyla Hadef ◽  
Brahim Hamad ◽  
Hebib Aggad
Keyword(s):  
Electrical Conductivity ◽  
Milk Yield ◽  
Subclinical Mastitis ◽  
Milk Composition ◽  
Fat Content ◽  
Ash Content ◽  
Culture Studies ◽  
Milk Samples ◽  
Standard Procedures ◽  
Lower Protein

This study investigated the effects of subclinical mastitis on milk yield and milk composition parameters in dairy camels. A total of 140 camel milk samples were collected from multiparous she-camels (7-10 years old) and were subjected to bacteriological culture studies; 76 samples displayed subclinical mastitis and 64 samples were healthy. Furthermore, the samples were analyzed via standard procedures to determine the yield and composition parameters of the milk such as pH, electrical conductivity, protein, fat, lactose, and ash content. The results showed that the milk yield was significantly low (p < 0.05) in infected animals compared to healthy animals (3.80 vs 4.32 L·day-1). Moreover, compared to the values observed in healthy milk samples, milk from animals with subclinical mastitis showed significantly decreased (p < 0.05) protein (3.33 vs 3.40%) and fat (3.67 vs 3.74%) contents. However, no significant changes (p > 0.05) were observed in pH, electrical conductivity, lactose, or ash content. The results of the uninfected milk samples revealed that there was significant correlation between the protein and fat content (r = 0.781; p < 0.01) and between the lactose and ash content (r = 0.701; p < 0.01). Conversely, the infected ones showed that there was higher significant correlation between the protein and fat contents (r = 0.807; p < 0.01) and a medium correlation between the lactose and ash contents (r = 0.603; p < 0.01). In conclusion, the results suggest that subclinical mastitis is negatively associated with a reduced milk yield and lower protein and fat content. Thus, these parameters can be used to diagnose mastitis in dairy camels.

scholarly journals Subclinical intramammary infection does not affect bovine milk ethanol stability

2018 ◽  
Vol 55 (2) ◽  
pp. e135173
Author(s):  
Cristian Marlon de Magalhães Rodrigues Martins ◽  
Juliano Leonel Gonçalves ◽  
Bruna Gomes Alves ◽  
Marcos André Arcari ◽  
Marcos Veiga dos Santos
Keyword(s):  
Bovine Milk ◽  
Subclinical Mastitis ◽  
Milk Composition ◽  
Dairy Herds ◽  
Intramammary Infection ◽  
Milk Samples ◽  
Lactating Cows ◽  
Natural Exposure ◽  
Major Pathogens ◽  
Ethanol Stability

The present study hypothesized that intramammary infection (IMI) might reduce milk ethanol stability (MES), mainly when IMI is caused by major pathogens. Thus, this study evaluated the effect of IMI on bovine MES using a natural exposure experimental design. Ninety-four lactating cows from five dairy herds were selected once they were determined to have an IMI, based on milk bacteriological culturing with positive isolation and somatic cell count (SCC) > 200×103 cells/mL in two out of three composite milk samples collected during three consecutive weeks. After selection, cows were sampled a second time (within two weeks) for evaluation at mammary quarter level (n = 326): milk yield (kg/quarter/day), MES, composition (fat, protein, lactose, casein, total solids and solids-non-fat), and bacteriologic culture. The effect of subclinical mastitis on MES was tested by two models: 1) comparison of healthy vs. infected quarters; and 2) comparison of contralateral mammary quarter within cow. The only milk composition variable associated with MES was lactose (r = 0.18; P < 0.01). Subclinical IMI did not affect MES when the comparison was performed using both models (1 and 2). Likewise, MES did not change when infected quarters were sorted into two groups of pathogens (major, minor and infrequent; and contagious, environmental, minor and infrequent) and compared with healthy mammary quarters. Considering the results of both models, subclinical IMI did not affect MES of dairy cows.

Influence of switch level of automatic cluster removers on milking performance and udder health

1993 ◽  
Vol 60 (3) ◽  
pp. 287-297 ◽  
Author(s):  
Morten D. Rasmussen
Keyword(s):  
Milk Yield ◽  
Flow Rate ◽  
Subclinical Mastitis ◽  
Clinical Mastitis ◽  
Negative Influence ◽  
Udder Health ◽  
Early Removal ◽  
Milk Flow

SummaryThe effect of a switch level of 200 or 400 g/min for automatic cluster removers on milking performance and udder health was measured with 71 first lactation cows in their first 36 weeks of lactation and with 64 older cows in their first 12 weeks of lactation. Early removal of the milking unit decreased machine-on time by 0·5 min, increased average milk flow rate slightly, improved teat condition significantly and reduced the change in teat end thickness during milking of first lactation cows. Early removal of the milking unit did not affect milk yield or composition, and the incidence and prevalence of subclinical mastitis were the same in the two groups. Fewer older cows developed clinical mastitis in the group switched at 400 g/min, but this was not significant. It is concluded that the milking unit can be detached at a milk flow rate of 400 instead of 200 g/min without having a negative influence on milk yield. Machine-on time is shortened and teat condition improved, and udder health does not seem to be affected.

Determination of factors affecting milk yield, composition and udder morphometry of Hair and cross-bred dairy goats in a semi-intensive system

2021 ◽  
pp. 1-5
Author(s):  
Hakan Erduran ◽  
Birol Dag
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Goat Milk ◽  
Milk Composition ◽  
Dairy Goats ◽  
Factors Affecting ◽  
Fat Yield ◽  
Positive Effect ◽  
Intensive System

Abstract In this Research Communication we report milk yield, milk composition and udder morphometry of Hair, Alpine × Hair F1 (AHF1), and Saanen × Hair F1 (SHF1) cross-bred goat genotypes managed in a semi-intensive system. The SHF1 genotype had significantly higher lactation milk yield, fat yield, protein yield, and electrical conductivity than other genotypes, whilst AHF1 was intermediate. The milk fat, protein, lactose, solids-non-fat and total solids contents as well as pH and density of the Hair goat milk were significantly higher than the corresponding values of the cross-bred genotypes. The highest correlation amongst udder characteristics and production was between lactation milk yield and udder volume (P < 0.01; r = from 0.63 to 0.77). The results of this study suggest that crossbreeding can have a positive effect on the milk production characteristics of local goats, thereby reducing the pressure on the ecosystem, and suggest that udder measurements, especially volume, can be a helpful tool for estimating milk yield.

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