Studies on the effects of cattle feeding strategies on greenhouse gas emissions are fragmented and cannot provide a global comparison of the feeding management practices that lead to optimal production while substantially reducing methane (CH4) and ammonia (NH3) emissions. The present study explains variability in enteric CH4, NH3 mitigations and cattle milk performance due to several diet composition and structure, feed management, breeding, animal experimental designs and CH4 measurement tools. Effects from 80 treatments were meta-analyzed from an initial 4394 screened papers and we retained 31 articles distributed across 15 countries on four continents. Minerals in feed additive types increased milk yield the most (90 %) and, concomitantly, reduced CH4 production by 33 %. Feed additive dosage ranging between 1 and 4 % also contributed to increasing milk yield by 47 % while reducing CH4 by 58 %. Meanwhile the impact of 3-nitrooxypropanol (3-NOP) feed additive on health safety is still controversial. Although a partial mixed ration system highly contributed to milk yield (102 %), it did not contribute to CH4 reduction as much as a total mixed ration system (39 %). The highest CH4 reduction levels were recorded with GreenFeed (80 %) and a rotating experimental design (37 %). The Holstein cattle breed was more productive with an increase of 46 % of milk production while reducing CH4 by 34 %. Grass forage increased NH3 by 5 % while crop forage reduced it by 21 %. Agriculture can effectively reduce its emissions and contribute to climate-neutral goals as part of a coordinated, global effort involving multiple sectors.
Tag: dairy industry
Volunteer farmer trainers boost Rwanda’s dairy sector with information on improved livestock feed practices
The major challenge facing the livestock sector and dairy sub-sector in particular is to satisfy the rising demand for livestock products. To meet the demand for meat and milk products, livestock productivity will need to increase significantly. Availability and access to feed resources is one of the major factors limiting livestock productivity. The problem of feeds in Rwanda include deficiency in animal feed, both in terms of quality and quantity. This arises from poor and few pastures, water shortage, poor quality of commercialized feeds and limited use of agricultural by products.
Practical Guide for Proper Milk Cooling and Storage – Rwanda
The agriculture sector in Rwanda plays a crucial role in the country’s economy, contributing over 31% to the national GDP and employing more than 70% of the workforce. However, challenges such as a rural-based economy and a 2.3% population growth rate put pressure on agricultural sustainability. The National Agricultural Policy (2018) aims to modernize the sector, shifting from subsistence farming to a knowledge-driven approach. The dairy industry, vital for food security, is a key focus of government investment, with targets to increase milk production and contribute 173 billion RWF to the GDP by 2022. Despite its current contribution of 10.5% to agricultural GDP (117 billion RWF annually), production faces hurdles like poor infrastructure and inconsistent supply chains.
To boost dairy production and reduce poverty, the Government of Rwanda has introduced targeted programs such as ‘One Cow per Poor Household’ (Girinka), alongside support from NGOs that strengthen Milk Collection Centres (MCCs). The ‘Practical Guide for Proper Milk Cooling and Storage – Rwanda’ provides MCC operators with strategies to maintain milk quality, offering guidance on cooling technologies, temperature control, storage design, energy efficiency, and quality monitoring. These interventions aim to enhance dairy sector efficiency, improve livelihoods, and ensure sustainable food production in Rwanda.
Hydroponic barley supplementation fed with high-protein diets improves the production performance of lactating dairy cows
The study investigated the effects of dietary protein level and the inclusion of hydroponic barley sprouts (HB) on lactation performance, blood biochemistry and N use efficiency in mid-lactation dairy cows. Treatments were arranged in a 2 × 2 factorial design with 2 CP levels (16.8% and 15.5% of DM), with HB (4.8% of DM, replacing 4.3% of alfalfa hay and 0.5% of distillers dried grains with solubles [DDGS]) or without HB. Forty-eight multiparous Holstein dairy cows (146 ± 15 DIM, 40 ± 5 kg/d of milk) were randomly allocated to 1 of 4 diets: high-protein diet (16.8% CP, HP), HP diet with HB (HP+HB), low-protein diet (15.5% CP, LP), or LP diet with HB (LP+HB). An interaction between CP × HB on DMI was detected, with DMI being unaffected by HB inclusion in cows fed the high-protein diets, but was lower in cows fed HB when the low-protein diet was fed. A CP × HB interaction was also observed on milk and milk protein yield, which was higher in cows fed HB with HP, but not LP. Inclusion of HB also tended to reduce milk fat content, and feeding HP resulted in a higher milk protein and MUN content, but lower milk lactose content. Feed efficiency was increased by feeding HP or HB diets, whereas N use efficiency was higher for cows fed LP or HB diets. There was an interaction on the apparent total-tract digestibility of DM and CP, which was higher when HB was fed along with HP, but reduced when fed with LP, whereas the digestibility of ADF was increased by feeding low-protein diets. In conclusion, feeding a low-protein diet had no adverse effect on cow performance, while feeding HB improved milk and milk component yield, and N efficiency when fed with a high-CP diet, but compromised cow performance with a low-CP diet.
Effects of source on bioavailability of selenium, antioxidant status, and performance in lactating dairy cows during oxidative stress-inducing conditions
In the current study, we used heat stress (HS) as an oxidative stress model to examine the effects of hydroxy-selenomethionine (HMSeBA), an organic selenium source, on selenium’s bioavailability, antioxidant status, and performance when fed to dairy cows. Eight mid-lactation Holstein dairy cows (141 ± 27 d in milk, 35.3 ± 2.8 kg of milk/d, parity 2 or 3) were individually housed in environmental chambers and randomly assigned to 1 of 2 treatments: inorganic Se supplementation (sodium selenite; SS; 0.3 mg of Se/kg of dry matter; n = 4) or HMSeBA supplementation (0.3 mg of Se/kg of dry matter; n = 4). The trial was divided into 3 continuous periods: a covariate period (9 d), a thermal neutral (TN) period (28 d), and a HS period (9 d). During the covariate and TN periods, all cows were housed in TN conditions (20°C, 55% humidity). During HS, all cows were exposed to cyclical HS conditions (32–36°C, 40% humidity). All cows were fed SS during the covariate period, and dietary treatments were implemented during the TN and HS periods. During HS, cows fed HMSeBA had increased Se concentrations in serum and milk, and total Se milk-to-serum concentration ratio compared with SS controls. Superoxide dismutase activity did not differ between Se sources, but we noted a treatment by day interaction in glutathione peroxidase activity as HS progressively reduced it in SS controls, whereas it was maintained in HMSeBA cows. Supplementation with HMSeBA increased total antioxidant capacity and decreased malondialdehyde, hydrogen peroxide, and nitric oxide serum concentrations compared with SS-fed controls. We found no treatment effects on rectal temperature, respiratory rate, or dry matter intake. Supplementing HMSeBA tended to increase milk yield and decrease milk fat percentage. No other milk composition parameters differed between treatments. We observed no treatment effects detected on blood biochemistry, except for a lower alanine aminotransferase activity in HMSeBA-fed cows. These results demonstrate that HMSeBA supplementation decreases some parameters of HS-induced oxidative stress.
Fodder shrubs for dairy farmers in East Africa: making extension decisions and putting them into practice
Fodder shrubs provide a valuable feed supplement for dairy cows and goats, especially during the dry season. Their clear benefits have resulted in their widespread adoption in many parts of East Africa. These woody shrubs can be managed to provide nutritious fodder from their leaves, to supplement the diets of livestock, particularly dairy cows and goats. The leaves contain much more protein than the rest of the animals’ normal diet of grasses and crop residues, and this makes them able to produce more milk. Other types of livestock can also benefit from the extra protein, but it has the biggest effect on milk production. The fodder plants are usually managed by repeated pruning so that they are kept in the form of multi-stemmed shrubs, usually grown in rows to form a hedge about m high. This is not, of course, the only possible way of managing them, but it is a system that has been thoroughly researched and tested, and has proved to be very well suited to the mixed small-scale farming system found in many parts of East Africa (mainly Kenya, Uganda, Tanzania and Rwanda). This book focuses specifically on this system, and on the species that are commonly used in it.
Embedding stakeholders’ priorities into the low-emission development of the East African dairy sector
A growing body of evidence shows that more intensive dairy systems can be good for both nature and people. Little research considers whether such systems correspond with local priorities and preferences. Using a mixed methods approach, this study examined the effects of three intensification scenarios on milk yield and emission intensities in Kenya and Tanzania. Scenarios included (a) an incremental change to feed management; (b) adaptive change by replacing poor quality grass with nutrient-rich fodder crops; and (c) multiple change involving concurrent improvements to breeds, feeds and concentrate supplementation. These scenarios were co-constructed with diverse stakeholder groups to ensure these resonate with local preferences and priorities. Modelling these scenarios showed that milk yield could increase by 2%–15% with incremental changes to over 200% with multiple changes. Greenhouse gas emission intensities are lowest under the multiple change scenario, reducing by an estimated 44%. While raising yields, incremental change conversely raises emission intensities by 9%. Our results suggest that while future interventions that account for local priorities and preferences can enhance productivity and increase the uptake of practices, far-reaching shifts in practices are needed to reduce the climatic footprint of the dairy sector. Since top-down interventions does not align with local priorities and preferences in many situations, future low-emission development initiatives should place more emphasis on geographic and stakeholder heterogeneity when designing targeting and implementation strategies. This suggests that in low-income countries, bottom-up approaches may be more likely to improve dairy productivity and align with mitigation targets than one-size-fits-all approaches.
Pathways toward inclusive low-emission dairy development in Tanzania: Producer heterogeneity and implications for intervention design
Reducing greenhouse gas (GHG) emissions from the agriculture sector – especially livestock – through low-emission development (LED) has attracted increased global attention. However, producers rarely prioritize emission reduction in their day-to-day practices, resulting in a mismatch between global and national environmental policies and local development interests. This raises the urgency of identifying overlapping solution spaces that would address global and national environmental targets and farmers’ production goals. The objective of this study is to identify pathways for scaling LED that better account for divergent smallholder capabilities, strategies, and interests. A multivariate cluster analysis was used to evaluate producer heterogeneity. The analysis utilized data from 1176 household surveys in Tanzania. Informed by these results, stakeholder workshops were held to identify how each group is uniquely constrained in the adoption of LED practices and viable paths forward. Our results reveal six distinct farmer types, distinguishable by their asset base, livestock ownership, cattle breeds, access to market, and income diversity. The six groups presented three levels of LED uptake, high, moderate, and low. Variants of technological packages and market-based interventions, access to better quality inputs, and extension services will be more impactful when correctly matched to producers’ asset portfolios, interests, and needs for the high and moderately intensifying producers. However, interventions that address both the knowledge and resource gaps for producers who demonstrate low uptake of LED will be more appropriate. Achieving GHG reduction will be modest from already intensifying groups and the low uptake groups, while moderately intensifying groups present the highest leverage for increased GHG reduction potential. This highlights how taking a food system approach rather than a technological package would be more beneficial especially in targeting groups that are not interested in LED. This study challenges the conceptualization of LED as a simple technological fix. We demonstrate that LED, as currently conceptualized, is not equally accessible or appealing to everyone. Consequently, successful LED uptake is contingent on donor and state ability to match LED strategies, local development priorities, and food systems objectives to develop more targeted needs-driven implementation pathways.
Feeding efficiency gains can increase the greenhouse gas mitigation potential of the Tanzanian dairy sector
We use an attributional life cycle assessment (LCA) and simulation modelling to assess the effect of improved feeding practices and increased yields of feed crops on milk productivity and GHG emissions from the dairy sector of Tanzania’s southern highlands region. We calculated direct non-CO2 emissions from dairy production and the CO2 emissions resulting from the demand for croplands and grasslands using a land footprint indicator. Baseline GHG emissions intensities ranged between 19.8 and 27.8 and 5.8–5.9 kg CO2eq kg−1 fat and protein corrected milk for the Traditional (local cattle) and Modern (improved cattle) sectors. Land use change contributed 45.8–65.8% of the total carbon footprint of dairy. Better feeding increased milk yields by up to 60.1% and reduced emissions intensities by up to 52.4 and 38.0% for the Traditional and Modern sectors, respectively. Avoided land use change was the predominant cause of reductions in GHG emissions under all the scenarios. Reducing yield gaps of concentrate feed crops lowered emissions further by 11.4–34.9% despite increasing N2O and CO2 emissions from soils management and input use. This study demonstrates that feed intensification has potential to increase LUC emissions from dairy production, but that fertilizer-dependent yield gains can offset this increase in emissions through avoided emissions from land use change.