Genetic factors affecting the composition and quality of cow’s milk

This chapter reviews the genetic factors affecting the composition and quality of cow's milk. It starts by discussing how different breeds of cattle can affect the composition of milk. The chapter then goes on to examine milk proteins, genetic variants and post-translational modifications. It then discusses milk coagulation and other functional properties, before highlighting the genetic influence of fatty acids on minor milk components. The chapter also discusses using mid-infrared spectroscopy for genetic parameter estimation, before concluding with a section on the possibilities for genetic improvement in relation to dairy milk.

Limited implementation of California’s Healthy Default Beverage law for children’s meals sold online

Objective: To reduce children’s sugar-sweetened beverage intake, California’s Healthy-By-Default Beverage law (SB1192) mandates only unflavored dairy/non-dairy milk or water be the default drinks with restaurant children’s meals. The objective of this study is to examine consistency with this law for meals sold through online platforms from restaurants in low-income California neighborhoods. Design: This observational, cross-sectional study examines beverage availability, upcharges (additional cost), and presentation of beverage options consistent with SB1192 (using 4 increasingly restrictive criteria) within a random sample of quick service restaurants (QSRs) in SNAP-Ed eligible census tracts selling children’s meals online from November 2020-April 2021. Setting: Low-income California neighborhoods (n=226 census tracts). Participants: QSRs that sold children’s meals online via a restaurant-specific platform, DoorDash, GrubHub, and/or UberEats (n=631 observations from 254 QSRs). Results: Seventy percent of observations offered water; 63% offered unflavored milk. Among all beverages, water was most likely to have an upcharge; among observations offering water (n=445), 41% had an upcharge (average $0.51). Among observations offering unflavored milk (n=396), 11% had an upcharge (average $0.38). No observations upcharged for soda (regular or diet). Implementation consistency with SB1192 ranged from 40.5% (using the least restrictive criteria) to 5.6% (most restrictive) of observations. Conclusions: Based on observations from restaurant websites and three of the most popular online ordering platforms, most California QSRs located in low-income neighborhoods are not offering children’s meal beverages consistent with the state’s Healthy-By-Default Beverage law. As the popularity of online ordering increases, further work to ensure restaurants are offering healthy default beverages with children’s meals sold online is necessary.

Tratamiento de metritis en bovinos productores de leche utilizando una nanoparticula de titanio con extractos adsorbidos de cítricos (NANOCIT) / The treatment of metritis in dairy milk cows by using citric extracts adsorbed to a titanium nanoparticle (NANOCIT)

La metritis en ganado lechero es el resultado de muchos factores tanto ambientales como de manejo, pero lo más importante es la presencia de bacterias causantes de metritis que se vuelven resistentes a los antibióticos que hasta la fecha se utilizan para restaurar el ambiente uterino a un estado de normalidad. En este trabajo se usó un extracto cítrico adsorbido a una nano partícula de Titanio (NANOCIT). En dos instalaciones ganaderas de producción de leche se medicaron vía intrauterina con CITNAN vacas lecheras con diagnóstico de metritis. Se observó que el uso de NANOCIT fue efectivo para el control de metritis con solo una o dos infusiones de NANOCIT. Al comparar con tratamientos utilizando antibióticos, y con los cuales la metritis fue controlada después de dos a tres días de aplicación del fármaco, el resultado fue altamente significativo en favor del uso de NANOCIT para el control de este padecimiento. Este avance tecnológico presenta una alternativa eco sustentable para el tratamiento de la metritis en ganado lechero. Avance tecnológico que presenta una alternativa eco sustentable para el tratamiento de la metritis en ganado lechero

Consumer Perception of Milk and Plant-Based Alternatives Added to Coffee

Consumers have begun to use plant-based alternatives (PBAs) in their coffee instead of dairy products. PBAs can include soy milk, rice milk, coconut milk, almond milk, oat milk, and hemp milk. The objective of this study was to investigate consumer acceptability and sensory perception of coffee with added dairy milk and added oat, soy, and almond PBAs. Consumers (n = 116) that frequently add milk to their coffee (n= 58) and consumers that usually use PBAs (n = 58) were recruited to participate in the study. They evaluated four different coffee samples with the addition of dairy milk as well as soy, almond, and oat PBAs. Overall, the consumers liking increased when they perceived sweetness in their coffee. The plant consumers (usually added PBAs to their coffee) liked the milk addition significantly less than the dairy consumers (usually added dairy to their coffee). In addition, the plant consumers were able to differentiate between the almond and soy PBAs, while the dairy consumers grouped them together. More studies need to be completed to investigate a wider range of PBAs, dairy products, and varieties of coffee.

Antibiotic Resistant Enterobacteriaceae in Milk Alternatives

The consumption of non-dairy milk is on the rise due to health benefits. Although there is increasing inclination towards milk alternatives (MA), there is limited data on antibiotic resistant bacteria in these substitutes. The aim of this study was to investigate antimicrobial resistance of bacteria isolated from MA. A total of 138 extracts from almonds (n = 63), cashew nuts (n = 36), and soybeans (n = 39) were analyzed for Enterobacteriaceae. The identification of the bacteria was based on biochemical and PCR methods. Antibiotic sensitivity was determined by using the Kirby-Bauer disk diffusion technique. Overall, 31% (43 of 138) of extracts were positive for Enterobacteriaceae. Ten bacterial species were identified, of which Enterobacter cloacae (42.7%) and Enterobacter cancerogenus (35.4%) were the most predominant species (p < 0.05). Antibiotic resistance was exhibited to vancomycin (88.3%), novobiocin (83.8%), erythromycin (81.1%), which was significantly higher (p < 0.05) than in tetracycline (59.5%), cefpodoxime (30.6%), and nalidixic acid (6.3%). There was no resistance displayed to kanamycin and imipenem. ERY-NOV-VAN-TET and ERY-NOV-CEP-VAN-TET were the most common resistant patterns displayed by Enterobacter cloacae. The findings of this study suggest that MAs, though considered healthy, may be a reservoir of multidrug resistant opportunist pathogens.

The Effects of Chronic Consumption of Lipid-Rich and Delipidated Bovine Dairy Milk on Brown Adipose Tissue Volume in Wild-Type Mice

Brown adipose tissue (BAT) activation is associated with increased energy expenditure by inducing non-shivering thermogenesis. The ingestion of a milk fat globule membrane (MFGM) supplement and a high calorie diet are reported gateways into BAT activation. However, little is known about the effect of the MFGM and high calorie diets on BAT volume. To gain insight into this, mice were maintained on a high-fat (HF) or low-fat (LF) diet in conjunction with either full-cream (FC) or skim bovine dairy milk (BDM). After being maintained on their respective diets for 13 weeks, their body composition, including BAT volume, was measured using X-ray microtomography. A high calorie diet resulted in an increase in the BAT volume and mice consuming an HF diet in conjunction with FC BDM had a significantly greater BAT volume than all the other groups. Conversely, mice consuming an HF diet in addition to skim milk had a lower BAT volume compared to the HF control. The data presented suggest that the consumption of a high calorie diet in conjunction with FC BDM increases the BAT volume in wild-type mice. This study may provide valuable insight into future studies investigating BAT volume and BAT activity in relation to environmental factors, including diet.

The effects of chronic consumption of lipid-rich and delipidated bovine dairy milk on brown adipose tissue volume in wild-type mice

Brown adipose tissue (BAT) activation is associated with increased energy expenditure by inducing non-shivering thermogenesis. Ingestion of a milk fat globule membrane (MFGM) supplement and a high calorie diet are reported gateways into BAT activation. However, little is known about the effect of MFGM and high calorie diets on BAT volume. To gain insight into this, mice were maintained on a high fat (HF) or low-fat (LF) diet in conjunction with either full-cream (FC) or skim bovine dairy milk (BDM). After being maintained on their respective diets for 13 weeks, body composition, including BAT volume, was measured using X-ray microtomography. A high calorie diet resulted in an increase in BAT volume and mice consuming a HF diet in conjunction with FC BDM had significantly greater BAT volume than all other groups. Conversely, mice consuming a HF diet in addition to skim milk had lower BAT volume compared to the HF control. The data presented suggests that consumption of a high calorie diet in conjunction with FC BDM increases BAT volume in wild-type mice. This study may provide valuable insight into future studies investigating BAT volume and BAT activity in relation to environmental factors including diet.

BACTERIOLOGICAL EVALUATION OF LOCALLY PRODUCED SOYBEAN MILK

Soybean milk is a regular beverage commonly sold across the streets and markets in Nigeria and beyond. The demand for soybean milk is fast growing due to its affordability and similarity to dairy milk, including its health benefits. However, there is a growing concern about the public health-related issues associated with this artisanal products production, storage, and distribution. The primary objective of the present investigation was to evaluate the bacteriological composition of the locally produced soybean milk commonly consumed in the Kogi state of Nigeria. The samples for the study were collected from vendors in different locations of the state. The analysis was conducted on the samples using established standard procedures. The result found certain microorganisms such as Micrococcus spp, Lactobacillus spp, Streptococcus spp, Enterobacter spp, Klebsiella spp, and other fungi, which comprises Aspergillus spp and Saccharomyces. The study concludes that the soybean milk consumed in the study parameter was mainly contaminated with varying bacteria.

Dietary predictors of prenatal per- and poly-fluoroalkyl substances exposure

Background Per- and poly-fluoroalkyl substances (PFAS) are commonly detected in a variety of foods and food packaging materials. However, few studies have examined diet as a potential source of PFAS exposure during pregnancy. In the present cross-sectional study, we examined prenatal PFAS levels in relation to self-reported consumption of meats, dairy products, and processed foods during pregnancy. Methods Participants were enrolled in the Chemicals in Our Bodies study, a demographically diverse pregnancy cohort in San Francisco, CA (N = 509). Diet was assessed using a self-reported interview questionnaire administered during the second trimester. Participants were asked on average how many times a day, week, or month they ate 11 different foods since becoming pregnant. Responses were categorized as at least once a week or less than once a week and foods were grouped into three categories: processed foods, dairy products, and meats. Twelve PFAS (ng/mL) were measured in second trimester serum samples. We investigated relationships between consumption of individual dairy products, meats, and processed foods and natural log-transformed PFAS using separate linear regression models adjusted for maternal age, education, race/ethnicity, and nativity. Results Seven PFAS were detected in ≥65% of participants. Consumption of dairy milk and cheese at least once per week was moderately associated with elevated levels of perfluorononanoic acid (PFNA) and perfluorodecanoic acid (PFDeA) relative to those who ate dairy products less than once week. The strongest associations observed were with PFDeA for dairy milk (β = 0.2, 95% confidence interval [CI] = 0.02, 0.39) and PFNA for cheese (β = 0.22, 95% CI = 0.02, 0.41). Eating fish, poultry, and red meat at least once per week was associated with higher levels of perfluoroundecanoic acid, PFDeA, PFNA, and perflucorooctane sulfonic acid. Conclusions Results indicate that consumption of animal products may contribute to elevated prenatal PFAS levels.