Methods of improving animal performance

1. A method of improving the European Production Efficiency Factor (EPEF) and/or feed conversion ratio (FCR) of a monogastric animal comprising administering an animal feed or animal feed additive comprising one or more microbial lysozymes to the monogastric animal wherein the microbial lysozyme is administered at a level of 8 to 250 ppm enzyme protein per kg animal feed and the microbial lysozyme

(a) has at least 95% sequence identity to SEQ ID NO: 1, 4 or 12, or

(b) is a fragment of SEQ ID NO: 1 comprising at least 200 amino acids; a fragment of SEQ ID NO: 4 comprising at least 240 amino acids; or a fragment of SEQ ID NO: 12 comprising at least 200 amino acids.

2. The method of claim 1 , wherein the FCR is improved by at least 1.0% compared to control.

3. The method of claim 1 , wherein the EPEF is improved by at least 1.0% compared to control.

4. The method of claim 1 , wherein the microbial lysozyme has antimicrobial activity toward Clostridium perfringens.

5. The method of claim 1 , wherein the animal feed or animal feed additive increases the proportion of bacteria of genus Faecalibacterium in the microbiota of the GI tract of an animal.

6. The method of claim 5 , wherein the proportion of bacteria of genus Faecalibacterium is increased by at least 1%.

7. The method of claim 5 , wherein the proportion of bacteria of genus Faecalibacterium is increased by a factor of at least 1.25.

8. The method of claim 1 , wherein the animal feed or animal feed additive improves the European Production Efficiency Factor (EPEF) and/or Feed Conversion Ratio (FCR) of an animal by at least 1% compared to control and increases the proportion of bacteria of genus Faecalibacterium in the microbiota of the GI tract of an animal.

9. The method of claim 8 , wherein the proportion of bacteria of genus Faecalibacterium is increased by at least 1%.

10. The method of claim 8 , wherein the proportion of bacteria of genus Faecalibacterium is increased by a factor of at least 1.25.

11. The method of claim 1 , wherein the monogastric animal is selected from the group consisting of swine, piglet, growing pig, sow, poultry, turkey, duck, quail, guinea fowl, goose, pigeon, squab, chicken, broiler, layer, pullet and chick, horse, crustaceans, shrimps, prawns, fish, amberjack, arapaima, barb, bass, bluefish, bocachico, bream, bullhead, cachama, carp, catfish, catla, chanos, char, cichlid, cobia, cod, crappie, dorada, drum, eel, goby, goldfish, gourami, grouper, guapote, halibut, java, labeo, lai, loach, mackerel, milkfish, mojarra, mudfish, mullet, paco, pearlspot, pejerrey, perch, pike, pompano, roach, salmon, sampa, sauger, sea bass, seabream, shiner, sleeper, snakehead, snapper, snook, sole, spinefoot, sturgeon, sunfish, sweetfish, tench, terror, tilapia, trout, tuna, turbot, vendace, walleye and whitefish.

12. The method of claim 1 , wherein the monogastric animal is selected from the group consisting of swine, piglet, growing pig, sow, chicken, broiler, layer, pullet and chick.

13. The method of claim 1 , wherein the microbial lysozyme is fed to the animal during the life span of the animal.

14. The method of claim 1 , wherein the microbial lysozyme is fed to broilers during the pre-starter (days 1-7) and/or starter (days 8-22) period or to piglets during the pre-starter (days 1-14 after weaning) and/or starter (days 15-42 after weaning) period.

15. The method of claim 1 , wherein the microbial lysozyme is obtained or obtainable from the phylum Ascomycota.

16. The method of claim 1 , wherein the microbial lysozyme is obtained or obtainable from the subphylum Pezizomycotina.

17. The method of claim 1 , wherein the microbial lysozyme comprises one or more domains selected from the list consisting of GH24 and GH25.

18. The method of claim 1 , wherein the microbial lysozyme is selected from the group consisting of amino acids 1 to 213 of SEQ ID NO: 1, amino acids 1 to 245 of SEQ ID NO: 4 and amino acids 1 to 208 of SEQ ID NO: 12.