新疆褐牛常见疾病的发生与防治

新疆褐牛是新疆地区农牧业的主要乳肉兼产牛,新疆褐牛的饲养过程简单粗放,同时其适应性比较强。该牛属于人工培育的新品种,近年来随着社会牛肉需求量比较大,使得新疆褐牛饲养量有了明显增加的趋势。在饲养的过程,一些疾病的出现很大程度上遏制了新疆褐牛的生长发育,使得农牧产业的经济增长受到限制,甚至有些时候严重的危害到牧区人民的生命安全,为其带来了巨大的经济损失。本文针对新疆褐牛经常出现的疾病探讨防治情况。

Study on Carcass Traits of Changtai Yak

For studying the germplasm charactedsUcs and carcass traits of Changtai yak, 8 adult yaks （5 male, 3 female） were selected and tested. The results showed that the pre-slaughter weight of the adult male and female Changtai yak was 364.32 and 266.83 kg, respectively, which presented extremely significant difference （P〈0.01）. The carcass weight, net bone weight net meat weight, and the ratio of bone to meat also showed extremely significant difference （P〈O.01）, which were 186.60 and 125.67 kg, 39.74 and 25.00 kg, 147.84 and 100.83 kg, 1：3.73 and 1： 4.03, respectively. The dressing percentage had significant difference which was 51.15% and 49.34%, respectively （P〈0.05）. The neat meat percentage and carcass meat production rate showed no significant difference which were 40.54% and 37.66%, 79.29% and 80.24%, respectively （P〉0.05）. It indicated that Changtai yak has better growth performance and meat performance potential, and worth of further studying and breeding.

Improvement Effect of Beef Cattle Frozen Semen of Different Varieties for Local Yellow Cattle

In the improvement process of local yellow cattle with frozen semen of beef cattle, the cows were grouped according to different cross combinations. Then, the conception rate, dystocia rate and reproductive survival rate of the cows in each group, as well as the body size and body weight of new-born calves, were ana- lyzed. The results showed that no significant differences were found in conception rate among different groups （P〉0.05）; there was no significant difference in dystocia rate between the A and C groups （P〉0.05）, but the dystocia rate in the B group was significantly different from those in the A and C groups （P〈0.05）. There were positive correlations between calf forehead width, chest circumference and the dys- tocia rate.

Sustainability and Market Orientation in the Brazilian Beef Chain

The demand for natural resources, energy and food facing the contemporary perception of sustainability is imposing challenges to the productive sectors in accordance with market guidelines. In this context, the Brazilian agribusiness seeks to maintain external competitiveness and to satisfy growing domestic demands. In beef production, this competitiveness pervades traceability, food safety and sustainability. This article aims to identify the sustainability state of the art in agribusiness and characterize it within the Brazilian beef chain. Descriptive methodology, combining a literature review and a documentary data survey were adopted. An outline of the dimensions of agribusiness sustainability, drawn from benchmark practices, indicates that environmental, social and technological demands have become part of the industry＇s agenda. The data for beef cattle point to a growth in production but demonstrate that expansion has occurred in areas of environmental tension, which creates a demand for sustainability in the beef chain. A table of guidelines for sustainability demonstrates that although perceptions are not yet harmonized among the links in the whole beef chain, many of the technological guidelines for sustainable production may increase the producer＇s economic efficiency. In the Brazilian case, the increment of initiatives and dissemination of sustainable practices among the beef chain is desirable to provide a coordinated response of production, processing and distribution organizations facing market opportunities for sustainable livestock.

Futuristic Applications for Profitable Beef Production Systems

The growing demands for red meats of people also present opportunities for fattening as well as improved markets for the animals. Beef production is a highly profitable venture with return of premium to the farmer. The large scale beef farming must be meet economic criteria for sustainable production. It consists of buying healthy stock, feeding and fattening them to optimum carcass weight, and selling them at any time of the year. They are handled in such a way that maximum growth is achieved at the lowest possible cost. The lifespan of operation is shorter and the return of investment is relatively higher. In beef farms which has very high genetic value of breeding animals cannot be get the expected performance without the use of technology and automation systems. Beef herd management programs if can be used as effectively, farming will have many advantages for consumer, farmer and also animals. However, to obtain these advantages from this system, required to have knowledge of the functions and effective use of the functions. The large amount of data in the obtained on many issues related to animals, herd management and an individual unless used in decisions about animals, ensuring the heavy data flow, record keeping or assessment will not give the expected results. In this study, it has been aiming that the examined the technologic applications at beef farms for sustainable and profitable meat production.

Growth Performance, Feed Conversion Ratio and Economics of Production of Native and Crossbred （Local x Holstein Friesian） Bulls for Fattening under Different Improved Feeding

An experiment was conducted to evaluate the growth performance and cost per gain of indigenous and crossbred （local x Holstein Friesian （L x HF）） bulls under four different improved feed treatments to determine the appropriate ration for economic organic beef production in Bangladesh. Twenty indigenous bulls （average body weight 208.08 ± 13.98 kg） and 20 crossbred （L x l-IF） bulls （average body weight 256.26 ± 26.85 kg） of 24 months age were divided into four equal groups and fed on four diets （T0, T1, T2 and T3） up to 120 d, where To referred to the conventional diet, and T1, T2 and T3 referred as improved organic diets. Required dry matter for individual animal was supplied by roughage and concentrate sources of the ration in the ratio of 2：1. Local grass and paddy straw were supplied to group T0 and T1, Napier grass and straw to group T2, and Napier grass （Pennisetum purpureum）, straw and Ipil-ipil leaf （Leuceana leucucephala） to group Ts as roughage; whereas, the concentrate was supplied as 1.5% of live weight. The results revealed that total dry matter intake （DMI）, total DMI as percent live weight （%LW）, feed conversion ratio （FCR） and average daily gain （ADG） varied significantly （P 〈 0.01） among different treatment groups. Breed also had significant （P 〈 0.01） effect on total DMI, FCR and ADG, but total DMI （%LW） was not affected by breed type. Feed cost expressed as per kg live weight gain （LWG） （BDT/kg LWG; 1USD = 78.95 BDT）, were also affected （P 〈 0.01） by feed treatments and breed type. Indigenous and crossbred bulls fed diet T3 had higher ADG （0.49 kg and 1.17 kg, respectively） and comparatively lower feed costs （156 BDT/kg LWG and 96.78 BDT/kg LWG, respectively）. But crossbred （L × HF） bulls showed the highest ADG （1.17 kg） and the lowest feed cost （96.78 BDT/kg LWG）. Therefore, considering the growth performance and cost per kg gain of the experimental animals, it may be concluded that the crossbred （Lx HF） bulls treated with T3 diet may be used for economic organic beef production in Bangladesh.

Analysis and Evaluation of Microbial Contamination of Raw Beef in Supermarkets in Phnom Penh

The study focused on analysis and evaluation of microbial contamination of raw beef was designed to （1） determine the presence of foodborne pathogens in raw beef; （2） compare the prevalence of microbial contamination among the three supermarkets, and （3） evaluate the sanitary quality of raw beef products. Also, six kind of microorganisms including Total Plate Count, Total Coliform and Fecal Coliform, which represented sanitary quality and E. coli, S. Aureus and B. cereus, which determined the presence of foodborne pathogens, were analyzed. The procedures used to analyse experimental samples taken from three supermarket （in every one week for three weeks） in Phnom Penh were based on Merck＇s study in 2005. The results had shown that there were no significant differences in Total Plate Counts, Total Coliform and Fecal Coliform in all samples, and they were found in unacceptable numbers in the raw beef products. However, the prevalence of foodborne pathogens including E. coli, S. aureus and B. cereus were found in acceptable numbers. Furthermore, the samples taken from the second supermarket had the highest level of microbial contamination among the three supermarkets, while the samples taken from the first supermarket had the lowest level of microbial contamination. This experimental finding demonstrated the need for sanitary improvement in the beef retails markets and strict sanitary guideline and implementation of these practices could guarantee consumers＇ health by consuming raw beefs with the lowest risk of foodborne pathogens.

Choice of Beef Herd Adaptation Strategy on Canadian Prairie Mixed Farms Under Extreme Climate Events

Economic impact of climate extremes on beef operation is expected to be significant due to its direct impact on feed production. Impact of such events on farm management and longer term farm financial situation is relatively unstudied in the Canadian Prairie. This study compared three alternative beef herd management strategies in dealing with climate extreme events under reference climate scenario of 1971-2000 and the future scenario of 2041-2070. The study used farm simulation model that integrated the model of cattle herd simulation, pasture model, crop simulation model combined with models of economic decisions. Purchasing feed and maintaining herd size is preferred option in dealing with drought Changes in management such as early weaning combined with limit feeding strategies reduce the feed demand and also reduce the financial burden during the years of extreme event, but it has severe negative consequences on amount of slaughter cattle sold. Cull herd strategy not only reduces feed demand but also increases income from sell of herd during the year/s of extreme event, but it severely impacts the farm＇s long term output supply potential. However, expansion of existing agriculture risk management policy to cover climate risk in beef production is necessary to support farmers in the year/s to extreme events.

Role of Buffalo in International Trade

The study analyzed the foreign trade performance of buffalo products using several indicators. These are the foreign trade structure by product and by Geographic distribution, time trend, instability, the free on board or freight on board （FOB） price ratio of buffalo to cattle revealed comparative advantage of tradable buffalo products. Thailand has the highest buffalo exports of live animals and hides. India exports the highest share of buffalo meat. Buffalo dairy products exports are rare due to lack of expanded dairy processing industries of buffalo milk and lacking of awareness towards the buffalo milk quality, which limits the demand for buffalo dairy products and shortage in supply beyond the domestic consumption. While buffalo stock all over the world represents 12% of the world bovine stock, its share in buffalo exports of meat is around 27% of the world bovine exports measured in tons in 2007. Such share shrinkages to 13.2% when measured in dollars. This shrinkage is due to lower prices of buffalo products than cattle products. The ratio of annual average ＂FOB price＂ of buffalo meat to bovine price was about one-half and for hides was about 40%, and for live buffalo was 14%. Reasons of the apparent lower FOB price of buffalo Exported Products than cattle are the low carcass weight of buffalo exported mainly for processing, low quality and limited demand for buffalo hides, and commonly, exporting live buffalo as weaned calves. Expansion in exports of buffalo products requires expansion in supply, through the potentiality of higher productivity, rather than stock size, to reach in balance with available feeds.

Meat Production through Evaluation of Stallion Prospects for Simmental and Simbrah Cattle

In the world, many research has been made to increase the quality and quantity of food production, and also to seek increase of accessibility of consumption for the population, especially in low economic income communities, where the consumption of protein may be very important for public health and sustainable development. The main objective of this study was to generate knowledge to increase food safety in the production of meat through the assessment of cattle that are prospect to be stallions of the Simmental and Simbrah breeds. This took place in Linares, Nuevo Leon, Mexico. The period of time for the test to get accurate data regarding food consumption in this study was 70 d. The Simmental breed surpasses the Simbrah breed, with respect to increase in daily weight and increase in final weight （P ≤ 0.05）. If Northeast México is looking to enhance food safety through a higher increase in final weight, then it should consider the Simmental breed as the most appropriate.