Statistical Centre of Iran > Metadata > Statistical Survey > Livestock


The statistical method and some of its characteristics

"Holding with livestock" is the statistical unit of this survey, which is considered as main and final statistical unit of the survey.

This survey was implemented as a two-stage sampling. In the first stage, 3933 sample villages and cities were selected from the frame of the 1382National Census of Agriculture. To select samples of the second stage in rural areas, at first the list of holders with livestock was prepared. Large holders were enumerated and some holders were selected as samples out of small holders, based on the sample survey, and questionnaires were completed for them. Using the frame of the 1382 National Census of Agriculture, the samples of the second stage in urban areas were directly prepared and sent to the executive organization of the survey in provinces for enumeration.

Information required for settled holder households and authorized corporations/public institutions were collected through face-to-face interviews with the holder or one of his/her household members. Information related to unsettled holders was collected through interviewing with him (if he/she was available) otherwise through interviewing with local informants.


Important notes for using statistical tables   

 Every statistical table comprises titles, column headers, description column and context of table whose contents should be paid attention carefully. The table includes numbers that form statistical information and can be understood and explained by three parts (title, column headers, description). In some cases, these three parts do not provide enough information to grasp the table; therefore footnotes, definitions and concepts, explanations and enumerator's guidebook should be taken into account. In title of the table, the subjects such as level of geographical coverage, statistical date and nature or the concept of the numbers in the table are totally explained. Column headers and description column accurately specify nature and concept of the information in crossed cell of the table.

In statistical tables of this survey, description column includes information related to classification of holdings with livestock.


General characteristics of the Survey



From the year 1339 through 1366, statistics and information for the livestock units’ activities as Rural Agricultural Surveys along with other information in agricultural sector were collected and published. After conducting National Census of Agriculture in the year 1367 and providing proper ground for taking thematic sample surveys on national livestock, livestock farming sample survey was taken in 1371 for the first time by using the frame of the National Census of Agriculture. After conducting the 1382 National Agricultural Census, the second, third and fourth Livestock surveys were conducted by using the frame of the 1384, 1387 and 1390 of Livestock survey.


Objectives of survey

The objective of the Livestock Survey is to estimate the statistical information on different areas such as "the number of livestock types", "the number of sold livestock for slaughtering”, "milk production", and "quantity of feeds consumption" and “employees” for better understanding of different aspects in this sector.

Survey method


The survey was conducted based on a two-stage sampling method.


Statistical population


In this survey, statistical population includes all holdings with livestock units’ activities (raising of sheep & lambs, goats & kids, cattle & calves, buffalos & calves and camels& calves) at the time of survey.



Statistical unit


In this survey, statistical unit is an agricultural holding with livestock units’ activity,  which at least has two heads of small livestock (sheep and goats) and/or at least one head of large livestock (cattle & calves, buffalos & calves and camels & calves).


Statistical frame


The sampling frame at the first stage includes the list of all cities and villages which had livestock units’ activities according to the results of the 1382 National Census of Agriculture and information on the number of livestock by type at the day of survey.

The sampling frame of the second stage in the urban areas includes the list of all holdings which had livestock farming activities at the day of the 1382 National Census of Agriculture and in the rural areas it includes the list of all the holdings which had livestock units’ activities at the day of the 1390 survey.


Sampling method


In this survey, a two-stage probability-stratified sampling method was used as follows:


With respect to the survey objectives and significant differences between sample units in terms of having livestock and its types at the first stage, these units were stratified according to the livestock unit variable.  Due to a large skewness of distribution of this variable, the phase method was used for stratification.

Sampling units of the first stage were selected by simple random method without replacement to each stratum. The sampling units of the second stage were classified into two groups: large holders and small holders, according to significant difference of the number of livestock. Large holders were enumerated and sample small holders in all cities and the villages of the second group were selected by simple random method without replacement and in the villages of the first group they were selected systematically.


Estimation relative error

The relative error for estimation of livestock unit variable was 4.76 percent and for milk production was 10.48 percent in this survey and for total country.


Statistical date


Statistical date for some parts of data is the day of the survey and for other parts, is the past 365 days as of the survey date.

Survey Date


The survey date was from 3 to 26 of Day1390 for 21 working days.



Method of information / data collection

The needed information is collected by face to face interview with the holder or a member of his /her household for settled holders' households. For unsettled households, the information is collected by interview in case of availability of the unsettled holder, otherwise, by interview with the local informants.



Level of information dissemination


The results of this survey were published provincewide.


Definitions and concepts


Agricultural activities

In the 1382 National Census of Agriculture, agricultural activities included farming, horticulture, greenhouse production, animal husbandry (livestock farming), traditional raising of poultry, raising of honeybee and raising of silkworm (in this enumeration, just animal husbandry was surveyed).


Livestock farming activity

It refers to raising of small and large livestock which may be done in a traditional or modern way.


Small livestock: refers to sheep & lambs and goats and kids.

Large livestock: refers to cattle & calves, buffalos& calves and camels& calves.



Agricultural holdings

All agricultural activities run by a single management are an "agricultural production unit" which is called "agricultural holding".

Holding with livestock

In this survey, each of agricultural holdings that has at least 2 heads of small livestock or one head of large livestock is called "holdings with livestock".



Agricultural holders

 Refer to members of one or more household(s) (natural persons) or a public institute/ authorized company (legal persons) who exercise management control over the agricultural holding. The holder(s) has technical and economic responsibility for the holding as well as direct role in its profit and loss.


Holder with livestock

This term is used for a person who has at least 2 heads of small livestock or one head of large livestock on the day of enumeration and manages the holding alone or jointly. He/she has or contributes to technical and economic responsibility for the holding as well as direct role in its profit and loss.



Persons living together in one residence, sharing their living expenses and eating together constitute a household.

Holder's household with livestock

 Is a household, at lease a member of whom has livestock on the day of enumeration based on the given conventional limits.

Settled holder

A natural person who has private holding within the limit of a village or a city of his own residence, or contributes to the management of one or more joint holdings with other households.


Unsettled holder

A natural person who lives in a city or a village other than the place of holding (in the sample city or village), regardless of having or not having a holding in the city or village of their own residence.



Authorized company / Public institute

Authorized company refers to any kind of company which is established and registered legally as a company. Public institute is any kind of government organization or non-private institute (except companies).