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You should do a literature review to find the appropriate values for both sensible heat production (SHP) and latent heat production (LHP).

From a cursory look, it looks like there is readily available data in the literature, usually expressed in $W/kg$ of poultry.

Here's one example, taken from a 2003 article "Sensible and Latent Heat Productions from Broilers in Laboratory Conditions" (PDF):

When initial DB temperature was 24.8 ± 0.2 °C and RH was 71%, SHP and LHP were 2.1 ± 0.3 W/kg and 4.0 ± 0.4 W/kg respectively

This other 2001 Article "Heat and Moisture Production of Poultry and Their Housing Systems: Broilers" (PDF) includes regression analysis of heat production as a function of a few parameters such as body mass (kg), air temperature, etc. It might be useful to draw conclusions if your broilers are in non-standard conditions for eg.

Speaking about harsh conditions (but really mostly because I find it hilarious), this 2004 paper "Ventilation, Sensible Heat Loss, Broiler Energy, and Water Balance Under Harsh Environmental Conditions" (PDF) could be of interest, and most of all has this picture of an IR chicken that I can't resist sharing:

Once you have this data, and knowing the poultry density and average body mass, in E+ you can use a People object to describe your poultry by adjusting the input as necessary.

You should do a literature review to find the appropriate values for both sensible heat production (SHP) and latent heat production (LHP).

From a cursory look, it looks like there is readily available data in the literature, usually expressed in $W/kg$ of poultry.

Here's one example, taken from a 2003 article "Sensible and Latent Heat Productions from Broilers in Laboratory Conditions" (PDF):

When initial DB temperature was 24.8 ± 0.2 °C and RH was 71%, SHP and LHP were 2.1 ± 0.3 W/kg and 4.0 ± 0.4 W/kg respectively

This other 2001 Article "Heat and Moisture Production of Poultry and Their Housing Systems: Broilers" (PDF) includes regression analysis of heat production as a function of a few parameters such as body mass (kg), air temperature, etc. It might be useful to draw conclusions if your broilers are in non-standard conditions for eg.eg, but it also show you heat production as a function of body mass (which is by design the goal of the growth cycle...)

Speaking about harsh conditions (but really mostly because I find it hilarious), this 2004 paper "Ventilation, Sensible Heat Loss, Broiler Energy, and Water Balance Under Harsh Environmental Conditions" (PDF) could be of interest, and most of all has this picture of an IR chicken that I can't resist sharing:

Once you have this data, and knowing the poultry density and average body mass, in E+ you can use a People object to describe your poultry by adjusting the input as necessary.